用面向对象的方法写选项卡功能-优快云博客

了解了面向对象之后，那我们来写下选项卡，，，

面向对象的选项卡

原则

先写出普通的写法，然后改成面向对象写法

普通方法变型

尽量不要出现函数嵌套函数

可以有全局变量

把onload中不是赋值的语句放到单独函数中

改成面向对象

全局变量就是属性

函数就是方法

Onload中创建对象

改this指向问题

<style>
#div1 div, #div2 div{ width:200px; height:200px; border:1px #000 solid; display:none;}
.active{ background:red;}
</style>
<script>
var oParent = null;
var aInput = null;
var aDiv = null;
	window.οnlοad=function(){
		var oParent = document.getElementById("div1");
		var aInput = oParent.getElementsByTagName("input");
		var aDiv = oParent.getElementsByTagName("div");
		init();
	};
    function init(){
    	for(var i=0; i<aInput.length;i++){
			aInput[i].index = i;
			aInput[i].οnclick=change;
		}
    }

    function change(){
		for(var i=0; i<aInput.length;i++){
			aInput[i].className="";
			aDiv[i].style.display="none";
		}
		this.className="active";
		aDiv[this.index].style.display="block";
	}
</script>
<div id="div1">
    <input class="active" type="button" value="1">
    <input type="button" value="2">
    <input type="button" value="3">
    <div style="display:block">11111</div>
    <div>22222</div>
    <div>33333</div>
</div>

这个是我们的传统写法

下面是我们改成面向对象的写法：

<style>
#div1 div, #div2 div{ width:200px; height:200px; border:1px #000 solid; display:none;}
.active{ background:red;}
</style>
<body>
<script>
window.onload = function(){
	var t1 = new Tab("div1");
	t1.init();
}

function Tab(id){
	this.oParent = document.getElementById(id);
	this.aInput = this.oParent.getElementsByTagName("input");
	this.aDiv = this.oParent.getElementsByTagName("div");
	this.iNow = 0;
}

Tab.prototype.init = function(){
	var This = this;
	for(var i=0; i<this.aInput.length;i++){
		this.aInput[i].index = i;
		this.aInput[i].οnclick=function(){
			This.change(this);
		}
	}	
}

Tab.prototype.change = function(obj){
	for(var i=0; i<this.aInput.length;i++){
		this.aInput[i].className="";
		this.aDiv[i].style.display="none";
	}
	obj.className="active";
	this.aDiv[obj.index].style.display="block";
}

</script>
<div id="div1">
    <input class="active" type="button" value="1">
    <input type="button" value="2">
    <input type="button" value="3">
    <div style="display:block">11111</div>
    <div>22222</div>
    <div>33333</div>
</div>

看代码的话，简单的功能可能用面向对象会觉得还复杂些。

如果说我们页面中有多个选项卡，第二选项卡多了一个自动播放的功能，，

那么我们可以这样添加

<style>
#div1 div, #div2 div{ width:200px; height:200px; border:1px #000 solid; display:none;}
.active{ background:red;}
</style>
<body>
<script>
window.onload = function(){
	var t1 = new Tab("div1");
	t1.init();
	var t2 = new Tab("div2");
	t2.init();
	t2.autoPlay();
}

function Tab(id){
	this.oParent = document.getElementById(id);
	this.aInput = this.oParent.getElementsByTagName("input");
	this.aDiv = this.oParent.getElementsByTagName("div");
	this.iNow = 0;
}

Tab.prototype.init = function(){
	var This = this;
	for(var i=0; i<this.aInput.length;i++){
		this.aInput[i].index = i;
		this.aInput[i].οnclick=function(){
			This.change(this);
		}
	}	
}

Tab.prototype.change = function(obj){
	for(var i=0; i<this.aInput.length;i++){
		this.aInput[i].className="";
		this.aDiv[i].style.display="none";
	}
	obj.className="active";
	this.aDiv[obj.index].style.display="block";
}

Tab.prototype.autoPlay = function(){
	var This = this;
	
	setInterval(function(){
		
		if(This.iNow == This.aInput.length-1){
			This.iNow = 0;
		}
		else{
			This.iNow++;
		}
		
		for(var i=0;i<This.aInput.length;i++){
			This.aInput[i].className = '';
			This.aDiv[i].style.display = 'none';
		}
		This.aInput[This.iNow].className = 'active';
		This.aDiv[This.iNow].style.display = 'block';
		
		
	},2000);
}
</script>
<div id="div1">
	<input class="active" type="button" value="1">
    <input type="button" value="2">
    <input type="button" value="3">
    <div style="display:block">11111</div>
    <div>22222</div>
    <div>33333</div>
</div>
<div id="div2">
	<input class="active" type="button" value="1">
    <input type="button" value="2">
    <input type="button" value="3">
    <input type="button" value="4">
    <div style="display:block">11111</div>
    <div>22222</div>
    <div>33333</div>
    <div>44444</div>
</div>
</body>

这样看就觉得好用多了