<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta name="author" content="daiqingyun">
<title>JQuery的无new创建以及链式调用</title>
</head>
<body>
<div class="demo">
<span>哈哈</span>
</div>
<div class="demo">哈哈哈</div>
<button type="button" name="button" id="btn">点击</button>
<script type="text/javascript">
(function(window, undefined) {
var jQuery = function(selector, context) {
//返回一个__proto__指向jQuery.fn.init.prototype的实例。
return new jQuery.fn.init(selector, context);
}
//隐藏prototype
jQuery.fn = jQuery.prototype = {
init: function(selector, context) {
var nodeList = document.querySelectorAll(selector);
this.length = nodeList.length;
for(var i = 0; i < this.length; i++) {
this[i] = nodeList[i];
}
return this;
},
//遍历器
each: function(fn) {
var length = this.length;
for(var i = 0; i < length; i++) {
fn.call(this[i], i, this[i]);
}
return this;
},
hide: function() {
this.each(function() {
this.style.display = 'none';
});
return this;
},
red: function() {
this.each(function() {
this.style.backgroundColor = "red";
});
return this;
},
font: function() {
this.each(function() {
this.style.color = "white";
});
return this;
}
}
//将实例的__proto__指向jQuery.prototype
jQuery.fn.init.prototype = jQuery.prototype;
window.$ = jQuery;
})(window);
$('#btn')[0].onclick = function() {
$('div').red().font();
}
</script>
</body>
</html>
