比较精简的Javascript拖动效果函数代码

2019-11-21 02:00:23

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<html>  <head><title>拖动效果函数演示 by Longbill.cn</title>  <style>  body   {      font-size:12px;      color:#333333;      border : 0px solid blue;  }  div  {      position : absolute;      background-color : #c3d9ff;      margin : 0px;      padding : 5px;      border : 0px;      width : 100px;      height:100px;  }  </style>  </head>  <body>  <script>  function drag(o,s)  {      if (typeof o == "string") o = document.getElementById(o);      o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;      o.orig_y = parseInt(o.style.top) - document.body.scrollTop;      o.orig_index = o.style.zIndex;                o.onmousedown = function(a)      {          this.style.cursor = "move";          this.style.zIndex = 10000;          var d=document;          if(!a)a=window.event;          var x = a.clientX+d.body.scrollLeft-o.offsetLeft;          var y = a.clientY+d.body.scrollTop-o.offsetTop;          //author: www.longbill.cn          d.ondragstart = "return false;"          d.onselectstart = "return false;"          d.onselect = "document.selection.empty();"                            if(o.setCapture)              o.setCapture();          else if(window.captureEvents)              window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);          d.onmousemove = function(a)          {              if(!a)a=window.event;              o.style.left = a.clientX+document.body.scrollLeft-x;              o.style.top = a.clientY+document.body.scrollTop-y;              o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;              o.orig_y = parseInt(o.style.top) - document.body.scrollTop;          }          d.onmouseup = function()          {              if(o.releaseCapture)                  o.releaseCapture();              else if(window.captureEvents)                  window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);              d.onmousemove = null;              d.onmouseup = null;              d.ondragstart = null;              d.onselectstart = null;              d.onselect = null;              o.style.cursor = "normal";              o.style.zIndex = o.orig_index;          }      }            if (s)      {          var orig_scroll = window.onscroll?window.onscroll:function (){};          window.onscroll = function ()          {              orig_scroll();              o.style.left = o.orig_x + document.body.scrollLeft;              o.style.top = o.orig_y + document.body.scrollTop;          }      }  }  </script>  <div id="div1" style="left:10px;top:10px;">div1:我可以被拖动</div>  <div id="div2" style="left:120px;top:10px;background-color : #f3d9ff">div2:来拖我呀</div>  <div id="div3" style="left:230px;top:10px;background-color : #c3ffff">div3:我随便你拖</div>  <div id="div4" style="left:10px;top:120px;background-color : #c3d944">div4:我可以随窗口滑动，把我拖到最下面，然后滚动网页看看</div>  <div id="div5" style="left:120px;top:120px;background-color : #f3d944">作者: Longbill<a href=http://www.longbill.cn target=_blank>www.longbill.cn</a>  </div>  <div id="div6" style="left:230px;top:120px;background-color : #e3f944;width:200px;">参数说明:  drag(obj [,scroll]);  obj:对象的id或对象本身;  scroll(可选):对象是否随窗口拖动而滑动，默认为否  鼠标右键查看源代码  </div>  <script>  drag("div1");  drag("div2");  drag("div3");  drag("div4",1);  drag("div5",1);  drag("div6",1);  </script>  </body>

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