js实现兼容PC端和移动端滑块拖动选择数字效果

2019-11-19 17:32:35

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本文为大家分享了js实现移动端滑块拖动选择数字的效果，可以通过鼠标拖拽滑动效果来选择数字，供大家参考，具体内容如下

<!DOCTYPE html><html lang="zh-cn">  <head>    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />    <title>鼠标拖动小方块</title>    <style type="text/css">      .lineDiv {        position: relative;        height: 5px;        background: red;        width: 300px;        margin: 50px auto;      }      .lineDiv .minDiv {        position: absolute;        top: -5px;        left: 0;        width: 15px;        height: 15px;        background: green;        cursor: pointer      }      .lineDiv .minDiv .vals {        position: absolute;        font-size: 20px;        top: -45px;        left: -10px;        width: 35px;        height: 35px;        line-height: 35px;        text-align: center;        background: blue;      }      .lineDiv .minDiv .vals:after {        content: "";        width: 0px;        height: 0px;        border-top: 6px solid blue;        border-left: 6px solid transparent;        border-right: 6px solid transparent;        border-bottom: 6px solid transparent;        display: block;        margin-left: 11px;      }    </style>  </head>  <body>    <center>      <h3>用鼠标拖动小方块<span id="msg">0</span>%</h3>    </center>    <div id="lineDiv" class="lineDiv">      <div id="minDiv" class="minDiv">        <div id="vals" class="vals">0</div>      </div>    </div>    <script>      window.onload = function() {        var lineDiv = document.getElementById('lineDiv'); //长线条        var minDiv = document.getElementById('minDiv'); //小方块        var msg = document.getElementById("msg");        var vals = document.getElementById("vals");        var ifBool = false; //判断鼠标是否按下        //事件        var start = function(e) {          e.stopPropagation();          ifBool = true;          console.log("鼠标按下")        }        var move = function(e) {          console.log("鼠标拖动")          if(ifBool) {            if(!e.touches) {  //兼容移动端              var x = e.clientX;            } else {   //兼容PC端              var x = e.touches[0].pageX;            }            //var x = e.touches[0].pageX || e.clientX; //鼠标横坐标var x            var lineDiv_left = getPosition(lineDiv).left; //长线条的横坐标            var minDiv_left = x - lineDiv_left; //小方块相对于父元素（长线条）的left值             if(minDiv_left >= lineDiv.offsetWidth - 15) {              minDiv_left = lineDiv.offsetWidth - 15;            }            if(minDiv_left < 0) {              minDiv_left = 0;            }            //设置拖动后小方块的left值            minDiv.style.left = minDiv_left + "px";            msg.innerText = parseInt((minDiv_left / (lineDiv.offsetWidth - 15)) * 100);            vals.innerText = parseInt((minDiv_left / (lineDiv.offsetWidth - 15)) * 100);          }        }        var end = function(e) {            console.log("鼠标弹起")            ifBool = false;          }          //鼠标按下方块        minDiv.addEventListener("touchstart", start);        minDiv.addEventListener("mousedown", start);        //拖动        window.addEventListener("touchmove", move);        window.addEventListener("mousemove", move);        //鼠标松开        window.addEventListener("touchend", end);        window.addEventListener("mouseup", end);        //获取元素的绝对位置        function getPosition(node) {          var left = node.offsetLeft; //获取元素相对于其父元素的left值var left          var top = node.offsetTop;          current = node.offsetParent; // 取得元素的offsetParent          　 // 一直循环直到根元素          　　          while(current != null) {　　            left += current.offsetLeft;　　            top += current.offsetTop;　　            current = current.offsetParent;　　          }          return {            "left": left,            "top": top          };        }      }    </script>  </body></html>

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