jQuery虽然好用但是，对于一些页面来说其实是没有并要加载这么大一个文件的，为了应对这个情况 ，对于jQuery的中各种方法我们就要能够自己去实现
下面是用js实现jQuery中的delegate
function Is(dom, selector) {
if (!
selector) {
return false;
}
if (~selector.indexOf('#')) {
//ID选择器
if ('#'+dom.id ==
selector ) {
return true;
}
return false;
}
if (~selector.indexOf('.')) {
//样式选择器
if (dom.classList && dom.classList.contains && dom.classList.contains(selector.substring(1,selector.length-1
))) {
return true;
}
if ('.'+dom.className ==
selector) {
return true;
}
return false;
}
//只有三种选择器，id class tagName
if (dom.tagName ==
selector ) {
return true;
}
return false;
}
Element.prototype.On =
function (selector, event, data, func) {
if (data
instanceof Function) {
func =
data;
data =
null;
}
this.addEventListener(event,
function (e) {
e = e ||
event;
var currentElement =
e.srcElement;
if (Is(currentElement,selector)) {
func.call(currentElement, data);
}
});
};
var ns = document.getElementsByTagName('body'
);
for (
var i
in ns) {
ns[i].On('.questionText', 'click',
function () {
alert("Success"
);
});
}
View Code
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<script type="text/javascript">
//Survey("123");
</script>
<script id="form" type="text/javascript">
function Is(dom, selector) {
if (!selector) {
return false;
}
if (~selector.indexOf('#')) {//ID选择器
if ('#'+dom.id == selector ) {
return true;
}
return false;
}
if (~selector.indexOf('.')) {//样式选择器
if (dom.classList && dom.classList.contains && dom.classList.contains(selector.substring(1,selector.length-1))) {
return true;
}
if ('.'+dom.className == selector) {
return true;
}
return false;
}
//只有三种选择器，id class tagName
if (dom.tagName == selector ) {
return true;
}
return false;
}
Element.prototype.On = function (selector, event, data, func) {
if (data instanceof Function) {
func = data;
data = null;
}
this.addEventListener(event, function (e) {
e = e || event;
var currentElement = e.srcElement;
if (Is(currentElement,selector)) {
func.call(currentElement, data);
}
});
};
var ns = document.getElementsByTagName('body');
for (var i in ns) {
ns[i].On('.questionText', 'click', function () {
alert("Success");
});
}
</script>
<div>
<textarea class="questionText" style="width:90%;height:auto; resize:none;"></textarea>
</div>
<div style="border:1px solid red;height:300px;">
werw
</div>
</body>
</html>
View Code
转载于:https://www.cnblogs.com/hmds/p/3393963.html
