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demo-html2canvas1.0.0-alpha.2.html
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demo-html2canvas1.0.0-alpha.2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>一键生成图片</title>
<!-- html2canvas将Dom节点在Canvas里边画出来 -->
<script src="js/html2canvas1.0.0-alpha.2.min.js"></script>
<!-- 将canvas图片保存成图片 -->
<script src="js/canvas2image.js"></script>
<script src="js/base64.js"></script>
<style>
p {
font-size: 15px;
font-family: 'Microsoft YaHei', 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'STHeiti', 'WenQuanYi Micro Hei', 'SimSun', sans-serif;
}
#content {
border-radius: 3px;
position: relative;
height: 504px;
}
button, #Download {
width: 105px;
height: 30px;
background-color: #22b4f6;
color: #fff;
text-align: center;
border-radius: 3px;
border: none;
}
#Download {
margin-left: 250px;
}
img {
width: 100%;
}
.ele {
position: absolute;
}
.ele-bg {
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
z-index: -1;
}
.ele-bg img {
height: 100%;
width: auto;
position: absolute;
left: 50%;
top: 0;
transform: translateX(-50%);
-webkit-transform: translateX(-50%);
}
.content {
position: relative;
overflow: hidden
}
</style>
</head>
<body>
<div>
<button id="btnSave">容器1转成图片</button>
<button id="btnSave2">容器2转成图片</button>
<button id="Download">下载图片</button>
<br/>
<br/>
<br/>
</div>
<div class="content" style="width:320px;border:1px solid #22b4f6;display:inline-block;text-align:center;">
<div style="display: block; height: 667px;">
<div class="ele-bg">
<img src="./upload/all/ae9d67b0ba2f11e7ab150f280ffc58cb.png">
</div>
</div>
</div>
<div class="content" style="width:320px;border:1px solid #22b4f6;display:inline-block;text-align:center;">
<div style="display: block; height: 667px;">
<div class="ele-bg">
<img src="./upload/all/ae9d67b0ba2f11e7ab150f280ffc58cb.png">
</div>
<div style="width: 320px; height: 508px; ">
<div class="ele" tyle="display:block;top: 303;left:78;">
<button>保存图片</button>
</div>
</div>
<div style="position:absolute;width:174px; left:58px; top:78px;">
测试测试testtest
</div>
</div>
</div>
</div>
<div style="width:60px;display:inline-block;text-align:center;font-size:30px;color:#22b4f6;">==>
</div>
<div id="images" style="width:320px;display:inline-block;text-align:center;vertical-align: top;">图片预览区</div>
</body>
<script>
window.onload = function () {
// 获取按钮id
var btnSave = document.getElementById('btnSave')
var btnSave2 = document.getElementById('btnSave2')
// 获取内容id
var content = document.querySelectorAll('.content')
// 进行canvas生成
btnSave.onclick = function () {
changePic(content[0])
}
btnSave2.onclick = function () {
changePic(content[1])
}
}
/*生成canvas图形*/
// html转成图片
function changePic(dom) {
var devPx = window.devicePixelRatio //设备像素，设置为1
window.devicePixelRatio = devPx > 1 ? 1 : 1; // 不设置为1，会导致canvas生成不是百分之100
html2canvas(dom, {
useCORS: true
}).then(function (canvas) {
//添加属性
canvas.setAttribute('id', 'thecanvas')
//读取属性值
document.getElementById('images').innerHTML = ''
document.getElementById('images').appendChild(canvas)
window.devicePixelRatio = devPx
})
}
</script>
<script>
/*
* 说明
* 不支持跨域图片
* 不能在浏览器插件中使用
* 部分浏览器上不支持SVG图片
* 不支持Flash
*/
var Download = document.getElementById('Download')
Download.onclick = function () {
var oCanvas = document.getElementById('thecanvas')
/*自动保存为png*/
// 获取图片资源
var img_data1 = Canvas2Image.saveAsPNG(oCanvas, true).getAttribute('src')
saveFile(img_data1, 'demo.png')
/*下面的为原生的保存，不带格式名*/
// 这将会提示用户保存PNG图片
// Canvas2Image.saveAsPNG(oCanvas);
}
// 保存文件函数
var saveFile = function (data, filename) {
// 有效的命名空间URIEdit
// HTML - 参阅 http://www.w3.org/1999/xhtml
// SVG - 参阅 http://www.w3.org/2000/svg
// XBL - 参阅 http://www.mozilla.org/xbl
// XUL - 参阅 http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul
var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a')
save_link.href = data
save_link.download = filename
var event = document.createEvent('MouseEvents')
event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
save_link.dispatchEvent(event)
}
</script>
</html>