标记toggle，indexOf

<head>
	<meta charset="UTF-8">
	<title></title>
	//css样式
	<style type="text/css">
		*{
			-webkit-transition: all .5s;
			-moz-transition: all .5s;
			-ms-transition: all .5s;
			-o-transition: all .5s;
			transition: all .5s;
		}
		
		.all{
			width: 1500px;
			text-align: center;
			margin: 0 auto;
		}
		
		.btn{
			width: 100px;
			height: 50px;
			margin-bottom: 20px;
			background-color: #4169E1;
			outline: none;
			border: 0;
			font-size: 20px;
			color: white;
		}
		
		.btn2{
			background-color: lightcoral;
		}
		
		.box {
			width: 1300px;
			overflow: hidden;
			border: 1px solid deeppink;
			margin: 0 auto;
			padding: 10px;
		}
		
		.box div {
			width: 50px;
			height: 50px;
			background-color: plum;
			float: left;
			margin: 10px;
			box-sizing: border-box;
		}
					
		.box .change{
			background-color: rebeccapurple;
			border-radius: 50%;
		}
		
		.box .clicked{
			border: 3px dotted deeppink;
		}
	</style>
</head>

<body>
	<div class="all">
		<button class="btn" id="btn">变色</button>
		<div id="box" class="box">
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
			<div></div>
		</div>
	</div>
	<script type="text/javascript">
		var boxDiv = document.getElementById("box");
		var oDivs = boxDiv.getElementsByTagName("div");
		var btn = document.getElementById("btn");
		var arr = [];
		for (var i = 0; i < oDivs.length; i++) {
			oDivs[i].index = i;
			oDivs[i].onclick = function(){
					// 得到 元素 在 arr 中的下标.
					// 如果indexOf(下标) ==-1 , 说明不存在
				if(arr.indexOf(this.index) == -1){
					// 不存在把下标放到数组中, 并添加边框样式
					arr.push(this.index);
					this.classList.add("clicked");
				}else{
					// 存在把下标移除, 无论是什么样式都清除
					arr.splice(arr.indexOf(this.index), 1);
					this.classList.remove("change");
					this.classList.remove("clicked");
				}
			}
		}
		var flag = true;
		btn.onclick = function(){
			// 本身操作
			if (flag) {
				btn.innerHTML = "不变色";
			} else{
				btn.innerHTML = "变色";
			}
			btn.classList.toggle("btn2");
			flag = !flag;
			// for 循环遍历装有 被点击 div 下标的数组
			// 通过下标取出每个被点击的 div, 然后变色
			 for (var i = 0; i < arr.length; i++) {
			 	 oDivs[arr[i]].classList.toggle("change");
			 }
		}
	</script>

</body>
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