本demo是div鼠标拖动事件，有点前端经验的都可以看懂
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1 {
width: 100px;
height: 100px;
background: red;
position: absolute;
}
#div2 {
width: 100px;
height: 100px;
background: yellow;
position: absolute;
left: 100px;
}
#div3 {
width: 100px;
height: 100px;
background: blue;
position: absolute;
left: 200px;
}
#div4 {
width: 100px;
height: 100px;
background: green;
position: absolute;
left: 300px;
}
</style>
<script>
//组件开发 : 多组对象，像兄弟之间的关系( 代码复用的一种形式 )
window.onload = function () {
var d1 = new Drag();
d1.init({ //配置参数
id: 'div1'
});
var d2 = new Drag();
d2.init({ //配置参数
id: 'div2'
});
bindEvent(d2, 'toDown', function () {
document.title = 'hello';
});
bindEvent(d2, 'toDown', function () {
document.body.style.background = 'black';
});
var d3 = new Drag();
d3.init({ //配置参数
id: 'div3'
});
bindEvent(d3, 'toDown', function () {
document.title = '妙味';
});
bindEvent(d3, 'toUp', function () {
document.title = '课堂';
});
var d4 = new Drag();
d4.init({ //配置参数
id: 'div4'
});
bindEvent(d4, 'toUp', function () {
document.title = 'byebye';
});
};
function Drag() {
this.obj = null;
this.disX = 0;
this.disY = 0;
this.settings = { //默认参数
};
}
Drag.prototype.init = function (opt) {
var This = this;
this.obj = document.getElementById(opt.id);
extend(this.settings, opt);
this.obj.onmousedown = function (ev) {
var ev = ev || window.event;
This.fnDown(ev);
fireEvent(This, 'toDown');
document.onmousemove = function (ev) {
var ev = ev || window.event;
This.fnMove(ev);
};
document.onmouseup = function () {
This.fnUp();
fireEvent(This, 'toUp');
};
return false;
};
};
Drag.prototype.fnDown = function (ev) {
this.disX = ev.clientX - this.obj.offsetLeft;
this.disY = ev.clientY - this.obj.offsetTop;
};
Drag.prototype.fnMove = function (ev) {
this.obj.style.left = ev.clientX - this.disX + 'px';
this.obj.style.top = ev.clientY - this.disY + 'px';
};
Drag.prototype.fnUp = function () {
document.onmousemove = null;
document.onmouseup = null;
};
function bindEvent(obj, events, fn) {
//obj : 楼层
//events : 书架
//fn : 一本书
obj.listeners = obj.listeners || {};
obj.listeners[events] = obj.listeners[events] || [];
obj.listeners[events].push(fn);
if (obj.nodeType) {
if (obj.addEventListener) {
obj.addEventListener(events, fn, false);
}
else {
obj.attachEvent('on' + events, fn);
}
}
}
function fireEvent(obj, events) { //主动触发自定义事件
if (obj.listeners && obj.listeners[events]) {
for (var i = 0; i < obj.listeners[events].length; i++) {
obj.listeners[events][i]();
}
}
}
function extend(obj1, obj2) {
for (var attr in obj2) {
obj1[attr] = obj2[attr];
}
}
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
<div id="div4"></div>
</body>
</html>