3.一个随机颜色的产生

来源：互联网发布：最好的电子书软件编辑：程序博客网时间：2024/04/29 13:20

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script>
// 自动跳转颜色
onload = function () {
var arr = ["red","blue","yellow","green","black"];
var Divv = document.getElementsByClassName("box1");
var btn = document.getElementById("box");
var timm = 0;
var n = 0 ;
btn.onclick = function (){
clearInterval(timm);
timm = setInterval(function () {
Divv[0].style.background = arr[n%arr.length]; // 防止数组溢界！！
n++;
if(n==arr.length){
n=0; //归零重新开始循环
}
},100);
}
}

// 随机颜色跳转
onload = function () {
var Divv = document.getElementsByClassName("box1");
var btn = document.getElementById("box");
var timm = 0;
var n = 0 ;
btn.onclick = function () {
clearInterval(timm); // 清除每次点击后的计时器
timm = setInterval(function () {
var a = parseInt(Math.random()*256); // 随机颜色的数值
var b = parseInt(Math.random()*256);
var c = parseInt(Math.random()*256);
var f = "rgb" + "(" + a + "," + b + "," + c + ")"; // 拼接rgb
Divv[0].style.background = f;
n++;
},500);
}
}

</script>
<style>
/* div{
height: 200px;
width: 200px;
} */

input {
width: 200px;
height: 200px;
border-radius: 50%;
position: fixed;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
outline: 0;
border: 0;
font-family: "微软雅黑";
font-size: 20px;

}
</style>
</head>
<body class= "box1">

<input id = "box" type = "button" value= "启动"/>

</body>
</html>

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