vue+mousemove实现鼠标拖动功能(拖动过快失效问题解决方法)

今天用vue+原生js的mousemove事件，写了个拖动，发现只能慢慢拖动才行，鼠标只要移动快了，就失效，不能拖动了；

搞了半天在，总算解决了，但是问题的深层原理还没搞清楚，知道的大侠可以留言分享，下面直接上代码：

只能慢速拖动的代码：

<!DOCTYPE html>
<html>
<head>
 <title>vue结合原生js实现拖动</title>
<script src="https://cdn.bootcss.com/vue/2.4.2/vue.min.js"></script>
</head>
<body>
<div id="app">
<div class="ctn ctn1">
 <div class="sub sub1" v-for="(site, index) in list1">
   <div class="dragCtn fixed" @mousedown="mousedown(site, $event)" @mousemove.prevent='mousemove(site, $event)' @mouseup='mouseup(site, $event)'>
   {{ site.name }}
   </div>
 </div>
</div>
<div class="ctn ctn2">
 <div class="sub sub2" v-for="(site, index) in list2">
   <div class="dragCtn">
    {{ index }} : {{ site.name }}
   </div>
 </div> 
</div> 
</div>
<script>
new Vue({
 el: '#app',
 data: {
 list1: [{name:'拖动我', index:0}],
 list2: [{name:'a', index:0}, {name:'b', index:1}, {name:'c', index: 2}, {name:'d', index: 3}],
 vm:'',
 sb_bkx: 0,
 sb_bky: 0,
 is_moving: false
 },
 methods: {
  mousedown: function (site, event) {
  var startx=event.x;
  var starty=event.y;
  this.sb_bkx=startx - event.target.offsetLeft;
  this.sb_bky=starty - event.target.offsetTop;
  this.is_moving = true;
  },
  mousemove: function (site, event) {
   var endx=event.x - this.sb_bkx;
  var endy=event.y - this.sb_bky;
  var _this = this
  if(this.is_moving){
   event.target.style.left=endx+'px';
   event.target.style.top=endy+'px';
  }
  },
  mouseup: function (e) {
  this.is_moving = false;
  }
 }
})
</script>
<style>
 .ctn{
  line-height: 50px;
  cursor: pointer;
  font-size: 20px;
  text-align: center;
  float: left;
 }
 .sub:hover{
  background: #e6dcdc;
  color: white;
  width: 100px;
 }
  .ctn1{
   border: 1px solid green;
   width: 100px;
  }
  .ctn2{
   border: 1px solid black;
   width: 100px;
   margin-left: 50px;
  }
  .fixed{
   width: 100px;
   height: 100px;
  position: fixed;
  background: red;
  left: 10px;
  top: 10px;
  cursor: move;
  }
</style>
</body>
</html>

可以快速拖动的代码：

<!DOCTYPE html>
<html>
<head>
 <title>vue结合原生js实现拖动</title>
<script src="https://cdn.bootcss.com/vue/2.4.2/vue.min.js"></script>
</head>
<body>
<div id="app">
<div class="ctn ctn1">
<!-- draggable=true -->
 <div class="sub sub1" v-for="(site, index) in list1">
 <!-- @mousemove.prevent='mousemove(site, $event)' -->
   <div class="dragCtn fixed" @mousedown="mousedown(site, $event)" @mouseup='mouseup(site, $event)'>
    {{ site.name }}
   </div>
 </div>
</div>
<div class="ctn ctn2">
 <div class="sub sub2" v-for="(site, index) in list2">
   <div class="dragCtn">
    {{ index }} : {{ site.name }}
   </div>
 </div> 
</div> 
</div>
<script>
new Vue({
 el: '#app',
 data: {
 list1: [{name:'拖动我', index:0}],
 list2: [{name:'a', index:0}, {name:'b', index:1}, {name:'c', index: 2}, {name:'d', index: 3}],
 vm:'',
 sb_bkx: 0,
 sb_bky: 0,
 },
 methods: {
  mousedown: function (site, event) {
  var event=event||window.event;
  var _target = event.target
  var startx=event.clientX;
  var starty=event.clientY;
  var sb_bkx=startx-event.target.offsetLeft;
  var sb_bky=starty-event.target.offsetTop;
  var ww=document.documentElement.clientWidth;
  var wh = window.innerHeight;
  if (event.preventDefault) {
   event.preventDefault();
  } else{
   event.returnValue=false;
  };
  document.onmousemove=function (ev) {
   var event=ev||window.event;
   var scrolltop=document.documentElement.scrollTop||document.body.scrollTop;
   if (event.clientY < 0 || event.clientX < 0 || event.clientY > wh || event.clientX > ww) {
    return false;
   };
   var endx=event.clientX-sb_bkx;
   var endy=event.clientY-sb_bky;
   _target.style.left=endx+'px';
   _target.style.top=endy+'px';
  }
  },
  mouseup: function (e) {
  document.onmousemove=null;
  }
 }
})
</script>
<style>
 .ctn{
  line-height: 50px;
  cursor: pointer;
  font-size: 20px;
  text-align: center;
  float: left;
 }
 .sub:hover{
  background: #e6dcdc;
  color: white;
  width: 100px;
 }
  .ctn1{
   border: 1px solid green;
   width: 100px;
  }
  .ctn2{
   border: 1px solid black;
   width: 100px;
   margin-left: 50px;
  }
  .fixed{
  width: 100px;
   height: 100px;
  position: fixed;
  background: red;
  left: 10px;
  top: 15px;
  cursor: move;
  }
</style>
</body>
</html>

补充:vue 自定义指令-拖拽

主要思想：获取拖拽的dom元素，在oDiv.onmousedown事件内获取鼠标相对dom元素本身的位置：

 var disX=ev.clientX-oDiv.offsetLeft;
 var disY=ev.clientY-oDiv.offsetTop;

再通过document.onmousemove事件计算dom元素左上角相对视口的距离：

var l=ev.clientX-disX;
var t=ev.clientY-disY;
oDiv.style.left=l+'px';
oDiv.style.top=t+'px';

完整代码：

 <script>
  /* vue-自定义指令-拖拽 */
  Vue.directive('drag',function(){
   var oDiv=this.el;
   oDiv.onmousedown=function(ev){
    var disX=ev.clientX-oDiv.offsetLeft;
    var disY=ev.clientY-oDiv.offsetTop;
    document.onmousemove=function(ev){
     var l=ev.clientX-disX;
     var t=ev.clientY-disY;
     oDiv.style.left=l+'px';
     oDiv.style.top=t+'px';
    };
    document.onmouseup=function(){
     document.onmousemove=null;
     document.onmouseup=null;
    };
   };
  });
  window.onload=function(){
   var vm=new Vue({
    el:'#box',
    data:{
     msg:'welcome'
    }
   });
  };
 </script>
</head>
<body>
 <div id="box">
  <div v-drag :style="{width:'100px', height:'100px', background:'blue', position:'absolute', right:0, top:0}"></div>
  <div v-drag :style="{width:'100px', height:'100px', background:'red', position:'absolute', left:0, top:0}"></div>
 </div>
</body>

总结

频道导航

vue+mousemove实现鼠标拖动功能(拖动过快失效问题解决方法)

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