js滑块验证解锁 JavaScript实现滑块验证解锁

时间:2021-01-28 努力的黑皮人气:0
<!DOCTYPE html>
<html lang="en">
 
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 // 引入矢量图标库
 <link rel="stylesheet" href="https://at.alicdn.com/t/font_2248239_eso2z5bskxk.css">
 <title>Document</title>
 <style>
 * {
  margin: 0;
  padding: 0;
 }
 
 .box {
  width: 300px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  background-color: #e8e8e8;
  box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.2);
  position: relative;
  margin-top: 100px;
  margin-left: 200px;
 }
 
 .box .bgColor {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
 }
 
 .box .tips {
  position: absolute;
  width: 100%;
  height: 40px;
  line-height: 40px;
  font-size: 14px;
  color: #000;
  text-align: center;
  user-select: none;
 }
 
 .ball {
  width: 50px;
  height: 38px;
  border: 1px solid #ccc;
  background: #fff;
  text-align: center;
  cursor: move;
  position: absolute;
  top: 0;
  left: 0;
 }
 </style>
</head>
 
<body>
 <div class="box">
 <div class="bgColor"></div>
 <div class="tips">滑动验证</div>
 <div class="ball"><i class="iconfont icon-double-arro-right"></i></div>
 </div>
</body>
<script>
 var box = document.getElementsByClassName("box")[0];
 var ball = document.getElementsByClassName("ball")[0];
 var bgColor = document.getElementsByClassName("bgColor")[0];
 var tips = document.getElementsByClassName("tips")[0];
 // 设置成功状态
 var isSuccess = false; //默认为false 不成功
 ball.onmousedown = function(e) {
 var e = e || window.event;
 
 // 获取鼠标相对于事件源左上角的位置
 var posx = e.offsetX;
 
 // 每次鼠标按下时 清除动画样式
 ball.style.transition = "";
 bgColor.style.transition = "";
 document.onmousemove = function(e) {
  var e = e || window.event;
  var x = e.pageX - box.offsetLeft - posx;
  var max = box.clientWidth - ball.clientWidth;
  if (x <= 0) {
  x = 0;
  }
  if (x >= max) {
  x = max;
  }
  bgColor.style.width = x + "px";
  ball.style.left = x + "px";
  bgColor.style.backgroundColor = "#6ff";
  if (x == max) {
  success();
  }
 }
 document.onmouseup = function() {
  // 如果没有解锁成功则返回原点
  if (!isSuccess) {
  bgColor.style.width = 0 + "px";
  ball.style.left = 0 + "px";
  ball.style.transition = "left 0.6s linear";
  bgColor.style.transition = "width 0.6s linear";
  }
  // 鼠标抬起时,移除鼠标移动事件和鼠标抬起事件
  document.onmouseup = null;
  document.onmousemove = null;
 }
 }
 // 定义一个滑块解锁成功的方法
 function success() {
 isSuccess = true;
 // 获取图标
 var icon = ball.firstElementChild;
 tips.textContent = "解锁成功";
 bgColor.style.backgroundColor = "lightgreen";
 icon.className = "iconfont icon-gou";
 icon.style.color = "lightgreen";
 //滑动成功时，移除鼠标按下事件
 ball.onmousedown = null;
 }
</script>
 
</html>
效果图如下:
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