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index-web.js
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index-web.js
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/* global define module require */
(function (factory) {
if (typeof define === "function" && define.amd) {
// AMD. Register as an anonymous module.
define(['prefix-umd'], factory);
} else if (typeof module === "object" && module.exports) {
// Node/CommonJS
module.exports = factory(require('prefix-umd'));
} else {
// Browser globals
window.SimpleScreenshot = factory(window.Prefix);
}
})(function (Prefix) {
//includes方法兼容
if (!Array.prototype.includes) {
Object.defineProperty(Array.prototype, 'includes', {
value: function (valueToFind, fromIndex) {
let o = Object(this);
let len = o.length >>> 0;
if (len === 0) {
return false;
}
let n = fromIndex | 0;
let k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
function sameValueZero(x, y) {
return x === y || (typeof x === 'number' && typeof y === 'number' && isNaN(x) && isNaN(y));
}
while (k < len) {
if (sameValueZero(o[k], valueToFind)) {
return true;
}
k++;
}
return false;
}
});
}
let dashTransform = Prefix.dash("transform");
let dashOrigin = Prefix.dash("transformOrigin");
let URL_REGEX = /url\(['"]?([^'"]+?)['"]?\)/g;
// 根据 computedStyle 判断伪类是否存在，此外还可以通过遍历 styleSheets 来判断。
let contentExit = function (computedStyle) {
let content = computedStyle['content'];
let display = computedStyle['display'];
let exist = true;
if (content != null) {
content = content.trim();
if (content == 'none' || (content == '' && display == 'inline')) {
exist = false;
}
} else {
exist = false;
}
if (!display || display == 'none') {
exist = false;
}
return exist;
}
let RESOURCE_NAME = [];
let RESOURCE_DATA = [];
function isFunction(obj) { // 判断对象是否是function
return obj && {}.toString.call(obj) === "[object Function]";
}
const COMPUTED_STYLE = [
"width",
"height",
"background-attachment",
"background-blend-mode",
"background-clip",
"-webkit-background-clip",
"background-color",
"background-image",
"background-origin",
"background-position",
"background-repeat",
"background-size",
"border-bottom-color",
"border-bottom-left-radius",
"border-bottom-right-radius",
"border-bottom-style",
"border-bottom-width",
"border-collapse",
"border-image-outset",
"border-image-repeat",
"border-image-slice",
"border-image-source",
"border-image-width",
"border-left-color",
"border-left-style",
"border-left-width",
"border-right-color",
"border-right-style",
"border-right-width",
"border-top-color",
"border-top-left-radius",
"border-top-right-radius",
"border-top-style",
"border-top-width",
"bottom",
"box-shadow",
"box-sizing",
"break-after",
"break-before",
"break-inside",
"caption-side",
"clear",
"clip",
"color",
"content",
"cursor",
"direction",
"display",
"empty-cells",
"float",
"font-family",
"font-kerning",
"font-optical-sizing",
"font-size",
"font-stretch",
"font-style",
"font-variant",
"font-variant-ligatures",
"font-variant-caps",
"font-variant-numeric",
"font-variant-east-asian",
"font-weight",
"image-rendering",
"isolation",
"justify-items",
"justify-self",
"left",
"letter-spacing",
"line-height",
"list-style-image",
"list-style-position",
"list-style-type",
"margin-bottom",
"margin-left",
"margin-right",
"margin-top",
"max-height",
"max-width",
"min-height",
"min-width",
"mix-blend-mode",
"object-fit",
"object-position",
"offset-distance",
"offset-path",
"offset-rotate",
"opacity",
"orphans",
"outline-color",
"outline-offset",
"outline-style",
"outline-width",
"overflow-anchor",
"overflow-wrap",
"overflow-x",
"overflow-y",
"padding-bottom",
"padding-left",
"padding-right",
"padding-top",
"pointer-events",
"position",
"resize",
"right",
"scroll-behavior",
"speak",
"table-layout",
"tab-size",
"text-align",
"text-align-last",
"text-decoration",
"text-decoration-line",
"text-decoration-style",
"text-decoration-color",
"text-decoration-skip-ink",
"text-underline-position",
"text-indent",
"text-rendering",
"text-shadow",
"text-size-adjust",
"text-overflow",
"text-transform",
"top",
"touch-action",
"unicode-bidi",
"vertical-align",
"visibility",
"white-space",
"widows",
"will-change",
"word-break",
"word-spacing",
"z-index",
"zoom",
"-webkit-appearance",
"backface-visibility",
"-webkit-border-horizontal-spacing",
"-webkit-border-image",
"-webkit-border-vertical-spacing",
"-webkit-box-align",
"-webkit-box-decoration-break",
"-webkit-box-direction",
"-webkit-box-flex",
"-webkit-box-ordinal-group",
"-webkit-box-orient",
"-webkit-box-pack",
"-webkit-box-reflect",
"column-count",
"column-gap",
"column-rule-color",
"column-rule-style",
"column-rule-width",
"column-span",
"column-width",
"backdrop-filter",
"align-content",
"align-items",
"align-self",
"flex-basis",
"flex-grow",
"flex-shrink",
"flex-direction",
"flex-wrap",
"justify-content",
"-webkit-font-smoothing",
"grid-auto-columns",
"grid-auto-flow",
"grid-auto-rows",
"grid-column-end",
"grid-column-start",
"grid-template-areas",
"grid-template-columns",
"grid-template-rows",
"grid-row-end",
"grid-row-start",
"row-gap",
"-webkit-highlight",
"hyphens",
"-webkit-hyphenate-character",
"-webkit-line-break",
"-webkit-line-clamp",
"-webkit-locale",
"-webkit-margin-before-collapse",
"-webkit-margin-after-collapse",
"-webkit-mask-box-image",
"-webkit-mask-box-image-outset",
"-webkit-mask-box-image-repeat",
"-webkit-mask-box-image-slice",
"-webkit-mask-box-image-source",
"-webkit-mask-box-image-width",
"-webkit-mask-clip",
"-webkit-mask-composite",
"-webkit-mask-image",
"-webkit-mask-origin",
"-webkit-mask-position",
"-webkit-mask-repeat",
"-webkit-mask-size",
"order",
"perspective",
"perspective-origin",
"-webkit-print-color-adjust",
"-webkit-rtl-ordering",
"shape-outside",
"shape-image-threshold",
"shape-margin",
"-webkit-tap-highlight-color",
"-webkit-text-combine",
"-webkit-text-decorations-in-effect",
"-webkit-text-emphasis-color",
"-webkit-text-emphasis-position",
"-webkit-text-emphasis-style",
"-webkit-text-fill-color",
"-webkit-text-orientation",
"-webkit-text-security",
"-webkit-text-stroke-color",
"-webkit-text-stroke-width",
"transform",
"transform-origin",
"transform-style",
"-webkit-user-drag",
"-webkit-user-modify",
"user-select",
"-webkit-writing-mode",
"-webkit-app-region",
"buffered-rendering",
"clip-path",
"clip-rule",
"mask",
"filter",
"flood-color",
"flood-opacity",
"lighting-color",
"stop-color",
"stop-opacity",
"color-interpolation",
"color-interpolation-filters",
"color-rendering",
"fill",
"fill-opacity",
"fill-rule",
"marker-end",
"marker-mid",
"marker-start",
"mask-type",
"shape-rendering",
"stroke",
"stroke-dasharray",
"stroke-dashoffset",
"stroke-linecap",
"stroke-linejoin",
"stroke-miterlimit",
"stroke-opacity",
"stroke-width",
"alignment-baseline",
"baseline-shift",
"dominant-baseline",
"text-anchor",
"writing-mode",
"vector-effect",
"paint-order",
"d",
"cx",
"cy",
"x",
"y",
"r",
"rx",
"ry",
"caret-color",
"line-break"
];
function SimpleScreenshot(params) {
this.devicePixelRatio = params.devicePixelRatio || 1;
this.error = params.error || function () {};
this.log = params.log || console.log;
this.puppeteerServer = params.puppeteerServer; // puppeteer 截屏服务
this.puppeteerGlobalFont = params.puppeteerGlobalFont; // puppeteer 截屏服务全局字体
this.pupServerCanModifyFont = params.pupServerCanModifyFont ? params.pupServerCanModifyFont : true; // puppeteer 截屏服务是否支持配置字体
this.imgType = params.imgType || 'jpeg'; //图片类型
this.imgQuality = parseInt(params.imgQuality) || 80; //图片质量
this.distWidth = params.distWidth; //目标尺寸
this.distHeight = params.distHeight;
this.debug = !params.debug ? false : true; // 调试模式
this.supportForeignObject = false; //是否支持 svg foreignobject 渲染
this.forceScreenshotType = params.forceScreenshotType; //强制截屏方式 server、client
if (this.forceScreenshotType == 'client') { //强制 client 截屏
this.supportForeignObject = true;
} else {
this.checkForeignObject();
}
this._isLoading = false; // 是否正在加载资源
this._wholeTexts = ""; // 全部文字
this._globalInlineFont = {
list: [],
value: ""
}; //全局字体
this.globalInlineFont = params.globalInlineFont || "";
//字体列表
this.fontList = [];
let fontList = params.fontList || [];
for (let i = 0; i < fontList.length; i++) {
this.fontList.push({
name: fontList[i],
texts: "",
});
}
//预加载资源
this.preLoadResource = params.preLoadResource || [];
for (let i = 0; i < this.preLoadResource.length; i++) {
let name = this.preLoadResource[i].name;
let data = this.preLoadResource[i].data;
if (data && data != "") {
RESOURCE_NAME.push(name);
RESOURCE_DATA.push(data);
}
}
/**
* 父元素的部分属性对子元素有影响，但是并不会被子元素继承，比如：opacity、transform、filter；
* 但是小程序中没办法获取父节点元素，目前的解决办法是手动计算，然后通过参数传递。
*/
this.parentCSS = params.parentCSS || [{
name: "opacity",
value: 1,
},
{
name: dashTransform, // 因为是给子元素截图，父元素的 transform-origin 等属性可以不考虑
value: "",
},
{
name: "filter",
value: "",
},
];
//自定义 css 解析过滤器
this.parseCSSFilter = params.parseCSSFilter || [];
/**
* 特殊规则
* autoRenderWidth 自适应渲染宽度，在小程序中因为字体原因，某些文字元素 fields size 并不精确，导致文字超出容器，从而溢出换行。
*/
this.rules = {
autoRenderWidth: false,
};
this.analysisStyleSheets();
}
//解析 stylesheets
SimpleScreenshot.prototype.analysisStyleSheets = function () {
this._hasWidthNodes = [];
this._hasHeightNodes = [];
try {
let styleSheets = document.styleSheets;
for (let i = 0; i < styleSheets.length; i++) {
let sheet = styleSheets[i]
for (let j = 0; j < sheet.cssRules.length; j++) {
let rule = sheet.cssRules[j];
if (rule.type == 1) { // CSSStyleRule
if (rule.style.width) { // 找出样式中设置了固定宽度的元素
let nodes = document.querySelectorAll(rule.selectorText);
for (let z = 0; z < nodes.length; z++) {
if (rule.style.width) {
if (!this._hasWidthNodes.includes[nodes[z]]) {
this._hasWidthNodes.push(nodes[z]);
}
}
}
}
} else if (rule.type == 3) { // CSSImportRule
//
} else if (rule.type == 4) { // CSSMediaRule
//
} else if (rule.type == 5) { // CSSFontFaceRule
this.loadResource({
name: rule.style.fontFamily,
value: rule.style.src
}, function () {}, function () {})
}
}
}
} catch (err) {
//
}
}
//判断浏览器是否支持 foreignobject 渲染
SimpleScreenshot.prototype.checkForeignObject = function () {
let svg = "";
svg += "<svg xmlns='http://www.w3.org/2000/svg' width='1' height='1'>";
svg += "<foreignObject width='100%' height='100%'>";
svg += "<div xmlns='http://www.w3.org/1999/xhtml' style='width:100%;height:100%;background-color:red;'></div>";
svg += "</foreignObject>";
svg += "</svg>"
let self = this;
let img = new Image();
img.src = "data:image/svg+xml;charset=utf-8," + encodeURIComponent(svg);
img.onload = function () {
let canvas = document.createElement('canvas');
canvas.width = 1;
canvas.height = 1;
let ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0, 1, 1);
let imgData = ctx.getImageData(0, 0, 1, 1).data;
if (imgData[0] == 255 && imgData[1] == 0 && imgData[2] == 0 && imgData[3] == 255) { // rgba(255, 0, 0, 255) 红色
self.supportForeignObject = true;
}
}
}
SimpleScreenshot.prototype.nodeItem = function (node, level) {
if (node.nodeType != Node.ELEMENT_NODE) {
return;
}
//获取元素信息
let tagName = node.tagName.toLowerCase();
let $node = {
node: node,
dataset: {
level: level,
name: tagName
},
style: {}, //自定义样式
after: null, //伪类样式
before: null
}
if (tagName == "img") {
$node.dataset.src = node.getAttribute("src");
}
$node.computedStyle = window.getComputedStyle(node);
//伪类
let after = window.getComputedStyle(node, ":after");
if (contentExit(after)) {
$node.after = after;
}
let before = window.getComputedStyle(node, ":before");
if (contentExit(before)) {
$node.before = before;
}
this.nodes.push($node);
//子元素
let start = 0;
let childs = node.childNodes;
for (let i = 0; i < childs.length; i++) {
let child = childs[i];
if (child.nodeType == Node.ELEMENT_NODE) { //元素
this.nodeItem(child, level + '-' + start);
start++;
}
}
}
SimpleScreenshot.prototype.toSVG = function (selector, callback) {
this._wholeTexts = "";
this.nodes = [];
let $first = document.querySelector(selector);
this.nodeItem($first, 0);
let self = this;
this.parseCSSRules(function () {
self.root = self.getNodeByLevel("0");
let rect = self.root.node.getBoundingClientRect();
let width = parseFloat(rect.width) * self.devicePixelRatio;
let height = parseFloat(rect.height) * self.devicePixelRatio;
let html = self.toHTML(self.root, true);
let svg = "";
svg += "<svg xmlns='http://www.w3.org/2000/svg'";
svg += " width='" + width + "'";
svg += " height='" + height + "'";
svg += ">";
svg += "<foreignObject width='100%' height='100%'>";
svg += "<div xmlns='http://www.w3.org/1999/xhtml' style='";
if (self.root.display == "inline-block") { // 防止行内元素的布局被空白字符挤乱
svg += "font-size : 0 ;"
}
self.parentCSS = self.calcParentProperty(self.root)
for (let i = 0; i < self.parentCSS.length; i++) {
let pCSS = self.parentCSS[i];
pCSS.value = pCSS.value == null ? "" : (pCSS.value + "").trim();
if (pCSS.name == dashTransform) {
pCSS.value += " scale(" + self.devicePixelRatio + ")" //考虑设备像素比
}
if (pCSS.value != "") {
svg += pCSS.name + " : " + pCSS.value + " ;";
}
}
svg += dashOrigin + ":0 0;'>";
svg += html;
svg += "</div>";
svg += "</foreignObject>";
svg += "</svg>"
callback({
svg: svg,
width: rect.width,
height: rect.height,
devicePixelRatio: self.devicePixelRatio,
distWidth: self.distWidth ? self.distWidth : rect.width * self.devicePixelRatio, // 默认显示尺寸乘以设备像素比
distHeight: self.distHeight ? self.distHeight : rect.height * self.devicePixelRatio,
fonts: self.fontList,
imgType: self.imgType,
imgQuality: self.imgQuality
});
})
};
//父元素的部分属性对子元素有影响，但是并不会被子元素继承，比如：opacity、transform、filter
SimpleScreenshot.prototype.calcParentProperty = function ($node) {
let list = [{
name: "opacity",
value: 1,
}, {
name: dashTransform, //因为是给子元素截图，父元素的 transform-origin 等属性可以不考虑
value: "",
}, {
name: "filter",
value: "",
}];
let $target = $node.node.parentElement;
while ($target != null) {
let css = window.getComputedStyle($target);
for (let i = 0; i < list.length; i++) {
let property = list[i];
let value = css.getPropertyValue(property.name);
switch (property.name) {
case 'opacity':
value = value == null ? 1 : parseFloat(value);
property.value *= value;
break;
case 'filter':
case dashTransform:
value = (value == null || value == 'none') ? '' : (' ' + value);
property.value += value;
break;
default:
break;
}
}
$target = $target.parentElement;
}
return list;
}
SimpleScreenshot.prototype.toIMG = function (selector, callback) {
let self = this;
self.toSVG(selector, function (svg) {
if (self.supportForeignObject && self.forceScreenshotType != 'server') {
// 插入本地全局字体
let index = svg.svg.indexOf("</style>");
svg.svg = svg.svg.substring(0, index) + self._globalInlineFont.value + svg.svg.substring(index, svg.svg.length);
self.debug && self.log(svg) // log
let base64 = "data:image/svg+xml;charset=utf-8," + encodeURIComponent(svg.svg);
self.toCanvas(base64, svg, function (canvas) {
callback({
canvas: canvas,
base64: canvas.toDataURL(`image/${svg.imgType}`, svg.imgQuality / 100)
});
})
} else {
if (self.puppeteerGlobalFont) {
if (!self.pupServerCanModifyFont) {
self.fontList.push({
name: self.puppeteerGlobalFont,
texts: self._wholeTexts
})
}
svg.globalFont = self.puppeteerGlobalFont; // 全局字体
}
self.debug && self.log(svg) // log
let xhr = new XMLHttpRequest();
xhr.open("POST", self.puppeteerServer);
// xhr.responseType = "blob"; // blob api、URL.createObjectURL 存在兼容性问题，返回数据类型使用 base64
xhr.onerror = function (err) {
self.error(err)
};
xhr.ontimeout = function (err) {
self.error(err)
};
xhr.onload = function () {
self.toCanvas(xhr.response, svg, function (canvas) {
callback({
canvas: canvas,
base64: xhr.response
});
})
};
xhr.send(JSON.stringify(svg));
}
})
}
SimpleScreenshot.prototype.toCanvas = function (base64, svg, callback) {
let img = new Image();
img.width = parseInt(svg.distWidth);
img.height = parseInt(svg.distHeight);
img.onload = function () {
let canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
let ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0, img.width, img.height);
if (isFunction(callback)) {
callback(canvas)
}
}
img.src = base64;
}
//元素转换为 html 代码
SimpleScreenshot.prototype.toHTML = function (node, isRoot) {
let html = "";
let inner = "";
//解析自身
let cssTexts = this.parseCSS(node, isRoot);
//伪类
if (node.after) {
inner += "<span style='" + cssTexts.after + "'></span>";
}
if (node.before) {
inner += "<span style='" + cssTexts.before + "'></span>"
}
//解析子元素
let childs = node.node.childNodes;
let start = 0;
for (let i = 0; i < childs.length; i++) {
let child = childs[i];
if (child.nodeType == Node.ELEMENT_NODE) { //元素
let level = node.dataset.level + "-" + start;
let curNode = this.getNodeByLevel(level);
if (curNode) {
inner += this.toHTML(curNode, false);
start++;
}
} else {
let fontFamily = this.getNodeStyle(node, "font-family");
for (let z = 0; z < this.fontList.length; z++) { // 根据字体拆分文字
let fontItem = this.fontList[z];
if (fontFamily.includes(fontItem.name)) {
for (let k = 0; k < child.wholeText.length; k++) {
if (!fontItem.texts.includes(child.wholeText[k])) { //去重
fontItem.texts += child.wholeText[k];
}
}
}
}
for (let k = 0; k < child.wholeText.length; k++) { //全部文字
if (!this._wholeTexts.includes(child.wholeText[k])) {
this._wholeTexts += child.wholeText[k];
}
}
/**
* 拼接 xml 时如果文本节点中存在条件分割符 & 应该写成 & 否则会报错 EntityRef: expecting ';'
*/
inner += child.wholeText.replace(/[\r\n]/g, "").replace(/&/g, "&"); //去掉换行符
}
}
//拼装
let tagName = node.dataset.name;
html += "<" + tagName + " xmlns='http://www.w3.org/1999/xhtml'";
if (node.dataset.src) {
let index = RESOURCE_NAME.indexOf(node.dataset.src);
if (index != -1) {
html += " src='" + RESOURCE_DATA[index] + "'";
} else {
html += " src='" + node.dataset.src + "'";
}
}
if (!isRoot) {
html += " style='" + cssTexts.style + "'>";
} else {
html += " id='simple-screenshot'>";
html += "<style>";
html += "#simple-screenshot,#simple-screenshot *:not(style){" + cssTexts.style + "} " + this.globalInlineFont;
html += "</style>";
}
html += inner;
html += "</" + tagName + ">";
return html;
}
//解析 cssRules
SimpleScreenshot.prototype.parseCSS = function (node, isRoot) {
let style = "";
let after = "";
let before = "";
node._rules = {
autoRenderWidth: this.rules.autoRenderWidth
}
for (let i = 0; i < this.parseCSSFilter.length; i++) { //自定义 css 解析过滤器
let filter = this.parseCSSFilter[i];
if (isFunction(filter)) {
filter(node)
}
}
for (let i = 0; i < COMPUTED_STYLE.length; i++) {
let name = COMPUTED_STYLE[i];
if (isRoot) { //根节点
if (["margin-top", "margin-left", "margin-bottom", "margin-right"].includes(name)) {
this.setNodeStyle(node, name, 0); //最外层元素的 margin 必须为 0，否则会因为偏移导致错位
} else if (["absolute", "fixed"].includes(this.getNodeStyle(node, "position")) && ["top", "bottom", "left", "right"].includes(name)) {
this.setNodeStyle(node, name, 0); //最外层元素为绝对定位或者固定定位时，top、bottom、left、right 必须为 0，否则会因为定位偏移导致错位
}
} else { //非根节点
if (this.getNodeStyle(node, name) == this.getNodeStyle(this.root, name)) {
continue;
}
}
if (name == "background-image") { //背景图片
style += this.parseBackgroundImage(this.getNodeStyle(node, name));
if (node.after) {
after += this.parseBackgroundImage(node.after[name]);
}
if (node.before) {
before += this.parseBackgroundImage(node.before[name]);
}
} else {
let nodeV = this.getNodeStyle(node, name);
style += name + ":" + nodeV + ";";
if (name == "font-family") { //字体
let n1 = RESOURCE_NAME.indexOf(nodeV)
if (n1 != -1 && !this._globalInlineFont.list.includes(nodeV)) {
this._globalInlineFont.list.push(nodeV);
this._globalInlineFont.value += "@font-face {font-family: '" + nodeV + "';src: url(" + RESOURCE_DATA[n1] + ");}"
}
}
if (node.after) {
let afterV = node.after[name];
after += name + ":" + afterV + ";";
if (name == "font-family") { //字体
let n2 = RESOURCE_NAME.indexOf(afterV)
if (n2 != -1 && !this._globalInlineFont.list.includes(afterV)) {
this._globalInlineFont.list.push(afterV);
this._globalInlineFont.value += "@font-face {font-family: '" + afterV + "';src: url(" + RESOURCE_DATA[n2] + ");}"
}
}
}
if (node.before) {
let beforeV = node.before[name];
before += name + ":" + beforeV + ";";
if (name == "font-family") { //字体
let n3 = RESOURCE_NAME.indexOf(beforeV)
if (n3 != -1 && !this._globalInlineFont.list.includes(beforeV)) {
this._globalInlineFont.list.push(beforeV);
this._globalInlineFont.value += "@font-face {font-family: '" + beforeV + "';src: url(" + RESOURCE_DATA[n3] + ");}"
}
}
}
}
}
if ((node._rules.autoRenderWidth || !this._hasWidthNodes.includes(node.node)) && !isRoot) {
style += "width: auto;";
}
return {
style: style,
after: after,
before: before
}
}
//解析
SimpleScreenshot.prototype.parseBackgroundImage = function (bgValue) {
let matches = null;
let style = "";
let isReplaceResource = false;
URL_REGEX.lastIndex = 0 //重置正则对象
matches = URL_REGEX.exec(bgValue) //匹配url值
if (matches != null) {
let url = matches[1];
if (bgValue && url && url.search(/^(data:)/) == -1) { //非dataurl
let index = RESOURCE_NAME.indexOf(url);
isReplaceResource = true;
if (index != -1) {
style += "background-image : url(" + RESOURCE_DATA[index] + ");";
} else {
/**
* 拼接 xml 时如果 url 中存在条件分割符 &，应该写成 & 否则会报错 EntityRef: expecting ';'
* 可以用 encodeURIComponent 编码来避免这个问题。
*/
style += "background-image : url(" + encodeURIComponent(url) + ");";
}
}
}
if (!isReplaceResource) {
style += "background-image :" + bgValue + ";";
}
return style;
}
//设置节点样式
SimpleScreenshot.prototype.setNodeStyle = function (node, name, value) {
node.style[name] = value;
}
//获取节点样式
SimpleScreenshot.prototype.getNodeStyle = function (node, name) {
return (node.style[name] != null) ? node.style[name] : node.computedStyle[name];
}
//根据级别获取节点
SimpleScreenshot.prototype.getNodeByLevel = function (level) {
for (let i = 0; i < this.nodes.length; i++) {
if (this.nodes[i].dataset.level == level) {
return this.nodes[i];
}
}
return null;
}
//解析 cssRules
SimpleScreenshot.prototype.parseCSSRules = function (finished) {
let count = 0;
let self = this;
self._isLoading = false;
let add = function () {
self._isLoading = true;
count++;
};
let del = function () {
count--;
if (count == 0) {
self._isLoading = true;
finished();
}
};
for (let i = 0; i < this.nodes.length; i++) {
let node = this.nodes[i];
// img src
if (node.dataset.src && node.dataset.src.length > 0) {
this.loadResource({
value: "url(" + node.dataset.src + ")"
}, add, del)
}
// background-image
let bgImg = node.computedStyle['background-image'];
if (bgImg && bgImg.length > 0 && bgImg != 'none') {
this.loadResource({
value: bgImg
}, add, del);
}
if (node.after) {
let afterImg = node.after['background-image']
if (afterImg && afterImg.length > 0 && afterImg != 'none') {
this.loadResource({
value: afterImg
}, add, del);
}
}
if (node.before) {
let beforeImg = node.before['background-image']
if (beforeImg && beforeImg.length > 0 && beforeImg != 'none') {
this.loadResource({
value: beforeImg
}, add, del);
}
}
}
if (count == 0) {
finished();
}
};
//根据后缀获取 dataurl 类型
SimpleScreenshot.prototype.getType = function (url) {
let types = [".png", ".jpg", ".jpeg", ".ttf"];
let names = ["image/png", "image/jpg", "image/jpg", "application/x-font-ttf"];
for (let i = 0; i < types.length; i++) {
if (url.lastIndexOf(types[i]) + types[i].length == url.length) {
return names[i]
}
}
return names[0];
}
//加载外部资源
SimpleScreenshot.prototype.loadResource = function (resource, add, del) {
URL_REGEX.lastIndex = 0; //重置正则对象
let matches = URL_REGEX.exec(resource.value); //匹配url值
let self = this;
if (matches != null) {
let url = matches[1];
let name = resource.name ? resource.name : url;
if (
resource.value &&
url &&