面向对象组件开发-自定义事件实例

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<!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'
})

    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 = 'beybye';
})

};

function Drag(){
    this.obj = null;
    this.disX = 0;
    this.disY = 0;

this.settings={

}

}

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 extend(obj1,obj2){
    for(var attr in obj2){
        obj1[attr] = obj2[attr];
    }
}

// 自定义事件---绑定事件

function bindEvent(obj,event,fn){

obj.lisenters=obj.lisenters||{};
obj.lisenters[event]=obj.lisenters[event]||[];
obj.lisenters[event].push(fn);

if(obj.nodeType){
    if(obj.addEventListener){
            obj.addEventListener(event,fn,false)
        }else{
            obj.attachEvent('on'+event,fn)
        }
    }
}

function fireEvent(obj,event){
    if(obj.lisenters && obj.lisenters[event]){
        for(var i=0;i<obj.lisenters[event].length;i++){
        obj.lisenters[event][i]();
        }
    }
}

</script>
</head>

<body>
    <div id="div1"></div>
    <div id="div2"></div>
    <div id="div3"></div>
    <div id="div4"></div>
</body>
</html>