<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.box {
position: relative;
width: 500px;
height: 40px;
border: 1px solid #000;
}
p {
position: relative;
z-index: 5;
font: 20px/40px '楷体';
text-align: center;
color: rgba(95, 90, 90, 0.479);
}
.btn {
width: 40px;
height: 40px;
border: 1px solid #ccc;
box-sizing: border-box;
background-color: #fff;
cursor: pointer;
z-index: 6;
position: absolute;
top: 0;
left: 0;
background-position: center;
background-repeat: no-repeat;
background-size: 50% auto;
background-image: url(./图1.png);
}
.bg {
height: 100%;
position: absolute;
top: 0;
left: 0;
background-color: #7ac23c;
}
</style>
</head>
<body>
<div class="box">
<div class="btn"></div>
<p>拖动滑块验证</p>
<div class="bg"></div>
</div>
</body>
<script>
//获取事件
var box = document.querySelector('.box')
var p = document.querySelector('p')
var btn = document.querySelector('.btn')
var bg = document.querySelector('.bg')
// 选中文字就会触发这个事件
this.box.onselectstart = function () {
return false // 阻止默认行为
}
//默认没有验证成功
var flag = false;
//按下事件
btn.onmousedown = function () {
var e1 = window.event;
var x1 = e1.offsetX;
//移动事件
btn.onmousemove = function () {
var e2 = window.event;
var x2 = e2.clientX
//计算left的值
var left = x2 - x1
if (left > 0) {
//设置滑动块的距离
this.style.left = left + 'px';
//设置背景的宽度
bg.style.width = left + 'px';
if (left > box.offsetWidth - this.offsetWidth) {
//验证成功
flag = true;
p.innerText = '通过验证'
p.style.color = '#000'
//事件清除
this.onmousedown = null;
this.onmousemove = null;
}
}
}
//鼠标松开
btn.onmouseup = function () {
//事件清除
this.onmousemove = null;
//判断验证是否成功
if (flag) {
return
}
this.style.left = 0; //设置滑动块的距离
bg.style.width = 0; //设置背景的宽度
};
}
</script>
</html>
