<!DOCTYPE html><html ><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>发送验证码</title><style>.contain{width:400px;height:200px;margin:100px auto;}.drag{width: 300px;height: 40px;line-height: 40px;background-color: #e8e8e8;position: relative;margin:0 auto;}.bg{width:40px;height: 100%;position: absolute;background-color: #75CDF9;}.text{position: absolute;width: 100%;height: 100%;text-align: center;user-select: none;}.btn{width:40px;height: 38px;position: absolute;border:1px solid #ccc;cursor: move;font-family: "宋体";text-align: center;background-color: #fff;user-select: none;color:#666;}</style></head><body><div class="contain"><div class="drag"><div class="bg"></div><div class="text" onselectstart="return false;">请拖动滑块解锁</div><div class="btn">>></div></div></div><script src="/ajaxjs/jquery.min.js"></script><script>//一、定义一个获取DOM元素的方法var $ = function(selector){return document.querySelector(selector);},box = $(".drag"),//容器bg = $(".bg"),//背景text = $(".text"),//文字btn = $(".btn"),//滑块success = false,//是否通过验证的标志distance = box.offsetWidth - btn.offsetWidth;//滑动成功的宽度（距离）//二、给滑块注册鼠标按下事件btn.onmousedown = function(e){//1.鼠标按下之前必须清除掉后面设置的过渡属性btn.style.transition = "";bg.style.transition ="";//说明：clientX 事件属性会返回当事件被触发时，鼠标指针向对于浏览器页面(或客户区)的水平坐标。//2.当滑块位于初始位置时，得到鼠标按下时的水平位置var e = e || window.event;var downX = e.clientX;//三、给文档注册鼠标移动事件document.onmousemove = function(e){var e = e || window.event;//1.获取鼠标移动后的水平位置var moveX = e.clientX;//2.得到鼠标水平位置的偏移量（鼠标移动时的位置 - 鼠标按下时的位置）var offsetX = moveX - downX;//3.在这里判断一下：鼠标水平移动的距离 与 滑动成功的距离 之间的关系if( offsetX > distance){offsetX = distance;//如果滑过了终点，就将它停留在终点位置}else if( offsetX < 0){offsetX = 0;//如果滑到了起点的左侧，就将它重置为起点位置}//4.根据鼠标移动的距离来动态设置滑块的偏移量和背景颜色的宽度btn.style.left = offsetX + "px";bg.style.width = offsetX + "px";//如果鼠标的水平移动距离 = 滑动成功的宽度if( offsetX == distance){//1.设置滑动成功后的样式text.innerHTML = "验证通过";text.style.color = "#fff";btn.innerHTML = "√";btn.style.color = "green";bg.style.backgroundColor = "lightgreen";//2.设置滑动成功后的状态success = true;//成功后，清除掉鼠标按下事件和移动事件（因为移动时并不会涉及到鼠标松开事件）btn.onmousedown = null;document.onmousemove = null;//3.成功解锁后的回调函数setTimeout(function(){alert('解锁成功！');},100);}}//四、给文档注册鼠标松开事件document.onmouseup = function(e){//如果鼠标松开时，滑到了终点，则验证通过if(success){return;}else{//反之，则将滑块复位（设置了1s的属性过渡效果）btn.style.left = 0;bg.style.width = 0;btn.style.transition = "left 1s ease";bg.style.transition = "width 1s ease";}//只要鼠标松开了，说明此时不需要拖动滑块了，那么就清除鼠标移动和松开事件。document.onmousemove = null;document.onmouseup = null;}}</script></body></html>
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