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js实现DIV背景色随机

2017-05-22 18:35 225 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>RandomColor</title>
<style>
*{
box-sizing: border-box;
list-style: none;
border: none;
padding: 0;
margin: 0;
}
p{
text-align: center;
margin: 20px;
}
p a{
font-size: 20px;
font-weight: 300;
color: #e4393c;
text-decoration: none;
padding: 6px 10px;
border: 1px solid currentColor;
}
.bg_color,.bg_two{
width: 100px;
height: 100px;
border: 1px solid #aa00aa;
margin-left: 10px;
}
.main,.main ul{
overflow: hidden;
}
.main{
width: 440px;
margin:30px auto;
}
.main ul li{
float: left;
}
</style>
</head>
<body>
<div class="main">
<p><a href="javascript:;" id="btn-one">RandomColor-rgb</a></p>
<ul>
<li><div class="bg_color"></div></li>
<li><div class="bg_color"></div></li>
<li><div class="bg_color"></div></li>
<li><div class="bg_color"></div></li>
</ul>
</div>
<div class="main">
<p><a href="javascript:;" id="btn-two">RandomColor-#XXXXXX</a></p>
<ul>
<li><div class="bg_two"></div></li>
<li><div class="bg_two"></div></li>
<li><div class="bg_two"></div></li>
<li><div class="bg_two"></div></li>
</ul>
</div>
</body>
<script>
(function(){
//1、随机色的函数-rgb
function getRandomColor(){
var rgb='rgb('+Math.floor(Math.random()*255)+','+Math.floor(Math.random()*255)+','+Math.floor(Math.random()*255)+')';
console.log(rgb);
return rgb;
}
//    获取按钮
var btn_one=document.querySelector("#btn-one");
var Divs=document.querySelectorAll(".bg_color");
btn_one.onclick=function(){
for(var i=0;i<Divs.length;i++){
Divs[i].style.backgroundColor=getRandomColor();
}
};
//2、随机颜色#XXXXXX
var btn_two=document.querySelector("#btn-two");
var divsTwo=document.querySelectorAll(".bg_two");
var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'];
function generateMixed(n) {
var res = "#";
var id;
for(var i = 0; i < n ; i ++) {
id= Math.floor(Math.random()*16);
res += chars[id];
}
console.log(id,res);
return res;
}
btn_two.onclick=function(){
for(var i=0;i<divsTwo.length;i++){
divsTwo[i].style.backgroundColor=generateMixed(6);
}
};
})()
</script>
</html>

演示地址：https://liuyanzhao.com/demo/randomBg/index.html

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