js鼠标拖曳 js实现鼠标拖曳效果

时间:2021-01-15 等待的L先生人气:0
js实现鼠标的拖曳效果，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
效果如下：
下面是代码：
<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>鼠标拖曳效果</title>
 <style>
 body{
  background:black;
 }
 #box{
  position:absolute;
  background: rgb(148, 143, 143);
  width: 400px;
  height: 200px;
  box-sizing: border-box;
  border: white 2px solid;
 }
 .topTitle{
  cursor: move;
  border-bottom: white 2px solid;
  background: #cccccc;
  text-align: right;
  color: white;
  height: 20px;
  line-height: 20px;

 }
 .content >div{

  background: rgb(148, 143, 143);
  height: 50px;
  line-height: 50px;
  color: white;
  text-align: left;
 }
 </style>
</head>
<body>
 
 <div id="box">
 <div class="topTitle"><a href="#" >点击回放拖动轨迹</a></div>
 <div class="content">
  <div>Drag:</div> 
  <div>offsetTop:</div> 
  <div>offsetLeft</div> 
 </div>
 </div>
</body>
<script>

 var oBox=document.getElementById("box");
 var oTopTitle=document.getElementsByClassName("topTitle")[0];
 var aDiv= document.querySelectorAll(".content >div");
 var offWidth=document.documentElement.clientWidth;
 var clHight=document.documentElement.clientHeight;
 var i,t;
 var state="false";

 var oText=document.querySelector(".topTitle a");
 oTopTitle.onmousedown=function(even){
 var OffsetE=even||window.event;
var flag=true;

//设立边界：
 
 document.onmousemove=function(even){
 state="true";
  var ClientE=even||window.event;
  l=ClientE.clientX-OffsetE.offsetX;
  t=ClientE.clientY-OffsetE.offsetY;
  recorde(l,t,flag);
 if(l<0){
  l=0;
 }
 if(t<0){
  t=0;
 }
 if(l>offWidth-oBox.offsetWidth){
  l=offWidth-oBox.offsetWidth;
 }
 if(t>clHight-oBox.offsetHeight){
  t=clHight-oBox.offsetHeight;
 }
  
  oBox.style.left=l+"px";
  oBox.style.top=t+"px";

 }
 
 document.onmouseup=function(){
  console.log(1);
  state="false";
 
  document.onmousemove=null;
  document.onmouseup=null;
 }
 OffsetE.preventDefault();
 flag=false;
 
 }
 oText.onclick=function(){
 var reback=recorde(l,t);

 var index=reback.strX.length;
 setInterval(function(){
 if(index<0){
  clearInterval();
  return;
 }
 oBox.style.left=reback.strX[index--]
 +"px";
 oBox.style.top=reback.strY[index--]+"px";
 },30);

 
  
 
 
strX=[];
 strY=[];
 
}
var strX=[];
var strY=[]; 
function recorde(offsetTop,offsetLeft,flag){

 
 
 var text1=aDiv[1].innerText;
 aDiv[0].innerHTML="Drag:"+"<span style='color:yellow'>"+state+"</span>";
 aDiv[1].innerHTML="offsetTop:"+"<span style='color:yellow'>"+offsetTop+"</span>";
 aDiv[2].innerHTML="offsetLeft:"+"<span style='color:yellow'>"+offsetLeft+"</span>";
 
 
 strX.push(offsetTop) ;
 strY.push(offsetLeft);
 // console.log(strX);
 // console.log(strY);
 return {
 strX,
 strY
 
 }

 }

</script>
</html>
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