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zjy.js
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zjy.js
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var log = console.log.bind(console)
var e = function(selector) {
var element = document.querySelector(selector)
if (element == null) {
var s = `元素没找到,选择器 ${selector} 没有找到或者 js 没有放在 body 前面`
alert(s)
} else {
return element
}
}
var es = function(selector) {
var elements = document.querySelectorAll(selector)
if (elements.length == 0) {
var s = `元素没找到,选择器 ${selector} 没有找到或者 js 没有放在 body 前面`
alert(s)
} else {
return elements
}
}
var appendHtml = function(element, html) {
element.insertAdjacentHTML('beforeend', html)
}
var bindEvent = function(element, eventName, callback) {
element.addEventListener(eventName, callback)
}
var removeClassAll = function(className) {
var selector = '.' + className
var elements = es(selector)
for (var i = 0; i < elements.length; i++) {
var e = elements[i]
e.classList.remove(className)
}
}
var bindAll = function(selector, eventName, callback) {
var elements = es(selector)
for (var i = 0; i < elements.length; i++) {
var e = elements[i]
bindEvent(e, eventName, callback)
}
}
// find 函数可以查找 element 的所有子元素
var find = function(element, selector) {
var e = element.querySelector(selector)
if (e == null) {
var s = `元素没找到,选择器 ${selector} 没有找到或者 js 没有放在 body 前面`
alert(s)
} else {
return e
}
}
var closestClass = function(element, className){
var e = element
while (e != null) {
if (e.classList.contains(className)) {
return e
} else {
e = e.parentElement
}
}
}
var closestId = function(element, idName){
var e = element
while (e != null) {
// 判断 e 是否包含 idName 这个 id
if (e.id == idName) {
return e
} else {
e = e.parentElement
}
}
}
var closestTag = function(element, tagName){
var e = element
while (e != null) {
// 判断 e 是否和 tagName 相等
if (e.tagName.toUpperCase() == tagName.toUpperCase()) {
return e
} else {
e = e.parentElement
}
}
}
var closest = function(element, selector){
var char = selector[0]
if (char == '.') {
var className = selector.slice(1)
return closestClass(element, className)
} else if (char == '#') {
var idName = selector.slice(1)
return closestId(element, idName)
} else {
var tag = selector
return closestTag(element, tag)
}
}