JS实现漂亮的窗口拖拽效果(可改变大小、最大化、最小化、关闭)

本文实例讲述了JS实现漂亮的窗口拖拽效果。分享给大家供大家参考。具体如下：

这是一款漂亮的JS窗口拖拽效果（改变大小/最小化/最大化/还原/关闭）

特点：

① 窗口可以拖动；
② 窗口可以通过八个方向改变大小；
③ 窗口可以最小化、最大化、还原、关闭；
④ 限制窗口最小宽度/高度。

运行效果截图如下：

在线演示地址如下：

http://demo.jb51.net/js/2015/js-win-drug-cha-close-demo/

具体代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>窗口拖拽（改变大小/最小化/最大化/还原/关闭）</title>
<style type="text/css">
body,div,h2{margin:0;padding:0;}
body{background:url(images/bg.jpg);font:12px/1.5 \5fae\8f6f\96c5\9ed1;color:#333;}
#drag{position:absolute;top:100px;left:100px;width:300px;height:160px;background:#e9e9e9;border:1px solid #444;border-radius:5px;box-shadow:0 1px 3px 2px #666;}
#drag .title{position:relative;height:27px;margin:5px;}
#drag .title h2{font-size:14px;height:27px;line-height:24px;border-bottom:1px solid #A1B4B0;}
#drag .title div{position:absolute;height:19px;top:2px;right:0;}
#drag .title a,a.open{float:left;width:21px;height:19px;display:block;margin-left:5px;background:url(images/tool.png) no-repeat;}
a.open{position:absolute;top:10px;left:50%;margin-left:-10px;background-position:0 0;}
a.open:hover{background-position:0 -29px;}
#drag .title a.min{background-position:-29px 0;}
#drag .title a.min:hover{background-position:-29px -29px;}
#drag .title a.max{background-position:-60px 0;}
#drag .title a.max:hover{background-position:-60px -29px;}
#drag .title a.revert{background-position:-149px 0;display:none;}
#drag .title a.revert:hover{background-position:-149px -29px;}
#drag .title a.close{background-position:-89px 0;}
#drag .title a.close:hover{background-position:-89px -29px;}
#drag .content{overflow:auto;margin:0 5px;}
#drag .resizeBR{position:absolute;width:14px;height:14px;right:0;bottom:0;overflow:hidden;cursor:nw-resize;background:url(images/resize.png) no-repeat;}
#drag .resizeL,#drag .resizeT,#drag .resizeR,#drag .resizeB,#drag .resizeLT,#drag .resizeTR,#drag .resizeLB{position:absolute;background:#000;overflow:hidden;opacity:0;filter:alpha(opacity=0);}
#drag .resizeL,#drag .resizeR{top:0;width:5px;height:100%;cursor:w-resize;}
#drag .resizeR{right:0;}
#drag .resizeT,#drag .resizeB{width:100%;height:5px;cursor:n-resize;}
#drag .resizeT{top:0;}
#drag .resizeB{bottom:0;}
#drag .resizeLT,#drag .resizeTR,#drag .resizeLB{width:8px;height:8px;background:#FF0;}
#drag .resizeLT{top:0;left:0;cursor:nw-resize;}
#drag .resizeTR{top:0;right:0;cursor:ne-resize;}
#drag .resizeLB{left:0;bottom:0;cursor:ne-resize;}
</style>
<script type="text/javascript">
/*-------------------------- +
 获取id, class, tagName
 +-------------------------- */
var get = {
  byId: function(id) {
    return typeof id === "string" ? document.getElementById(id) : id
  },
  byClass: function(sClass, oParent) {
    var aClass = [];
    var reClass = new RegExp("(^| )" + sClass + "( |$)");
    var aElem = this.byTagName("*", oParent);
    for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
    return aClass
  },
  byTagName: function(elem, obj) {
    return (obj || document).getElementsByTagName(elem)
  }
};
var dragMinWidth = 250;
var dragMinHeight = 124;
/*-------------------------- +
 拖拽函数
 +-------------------------- */
function drag(oDrag, handle)
{
  var disX = dixY = 0;
  var oMin = get.byClass("min", oDrag)[0];
  var oMax = get.byClass("max", oDrag)[0];
  var oRevert = get.byClass("revert", oDrag)[0];
  var oClose = get.byClass("close", oDrag)[0];
  handle = handle || oDrag;
  handle.style.cursor = "move";
  handle.onmousedown = function (event)
  {
    var event = event || window.event;
    disX = event.clientX - oDrag.offsetLeft;
    disY = event.clientY - oDrag.offsetTop;
    document.onmousemove = function (event)
    {
      var event = event || window.event;
      var iL = event.clientX - disX;
      var iT = event.clientY - disY;
      var maxL = document.documentElement.clientWidth - oDrag.offsetWidth;
      var maxT = document.documentElement.clientHeight - oDrag.offsetHeight;
      iL <= 0 && (iL = 0);
      iT <= 0 && (iT = 0);
      iL >= maxL && (iL = maxL);
      iT >= maxT && (iT = maxT);
      oDrag.style.left = iL + "px";
      oDrag.style.top = iT + "px";
      return false
    };
    document.onmouseup = function ()
    {
      document.onmousemove = null;
      document.onmouseup = null;
      this.releaseCapture && this.releaseCapture()
    };
    this.setCapture && this.setCapture();
    return false
  };
  //最大化按钮
  oMax.onclick = function ()
  {
    oDrag.style.top = oDrag.style.left = 0;
    oDrag.style.width = document.documentElement.clientWidth - 2 + "px";
    oDrag.style.height = document.documentElement.clientHeight - 2 + "px";
    this.style.display = "none";
    oRevert.style.display = "block";
  };
  //还原按钮
  oRevert.onclick = function ()
  {
    oDrag.style.width = dragMinWidth + "px";
    oDrag.style.height = dragMinHeight + "px";
    oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";
    oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";
    this.style.display = "none";
    oMax.style.display = "block";
  };
  //最小化按钮
  oMin.onclick = oClose.onclick = function ()
  {
    oDrag.style.display = "none";
    var oA = document.createElement("a");
    oA.className = "open";
    oA.href = "javascript:;";
    oA.title = "还原";
    document.body.appendChild(oA);
    oA.onclick = function ()
    {
      oDrag.style.display = "block";
      document.body.removeChild(this);
      this.onclick = null;
    };
  };
  //阻止冒泡
  oMin.onmousedown = oMax.onmousedown = oClose.onmousedown = function (event)
  {
    this.onfocus = function () {this.blur()};
    (event || window.event).cancelBubble = true
  };
}
/*-------------------------- +
 改变大小函数
 +-------------------------- */
function resize(oParent, handle, isLeft, isTop, lockX, lockY)
{
  handle.onmousedown = function (event)
  {
    var event = event || window.event;
    var disX = event.clientX - handle.offsetLeft;
    var disY = event.clientY - handle.offsetTop;
    var iParentTop = oParent.offsetTop;
    var iParentLeft = oParent.offsetLeft;
    var iParentWidth = oParent.offsetWidth;
    var iParentHeight = oParent.offsetHeight;
    document.onmousemove = function (event)
    {
      var event = event || window.event;
      var iL = event.clientX - disX;
      var iT = event.clientY - disY;
      var maxW = document.documentElement.clientWidth - oParent.offsetLeft - 2;
      var maxH = document.documentElement.clientHeight - oParent.offsetTop - 2;          var iW = isLeft ? iParentWidth - iL : handle.offsetWidth + iL;
      var iH = isTop ? iParentHeight - iT : handle.offsetHeight + iT;
      isLeft && (oParent.style.left = iParentLeft + iL + "px");
      isTop && (oParent.style.top = iParentTop + iT + "px");
      iW < dragMinWidth && (iW = dragMinWidth);
      iW > maxW && (iW = maxW);
      lockX || (oParent.style.width = iW + "px");
      iH < dragMinHeight && (iH = dragMinHeight);
      iH > maxH && (iH = maxH);
      lockY || (oParent.style.height = iH + "px");
      if((isLeft && iW == dragMinWidth) || (isTop && iH == dragMinHeight)) document.onmousemove = null;
      return false;
    };
    document.onmouseup = function ()
    {
      document.onmousemove = null;
      document.onmouseup = null;
    };
    return false;
  }
};
window.onload = window.onresize = function ()
{
  var oDrag = document.getElementById("drag");
  var oTitle = get.byClass("title", oDrag)[0];
  var oL = get.byClass("resizeL", oDrag)[0];
  var oT = get.byClass("resizeT", oDrag)[0];
  var oR = get.byClass("resizeR", oDrag)[0];
  var oB = get.byClass("resizeB", oDrag)[0];
  var oLT = get.byClass("resizeLT", oDrag)[0];
  var oTR = get.byClass("resizeTR", oDrag)[0];
  var oBR = get.byClass("resizeBR", oDrag)[0];
  var oLB = get.byClass("resizeLB", oDrag)[0];
  drag(oDrag, oTitle);
  //四角
  resize(oDrag, oLT, true, true, false, false);
  resize(oDrag, oTR, false, true, false, false);
  resize(oDrag, oBR, false, false, false, false);
  resize(oDrag, oLB, true, false, false, false);
  //四边
  resize(oDrag, oL, true, false, false, true);
  resize(oDrag, oT, false, true, true, false);
  resize(oDrag, oR, false, false, false, true);
  resize(oDrag, oB, false, false, true, false);
  oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";
  oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";
}
</script>
</head>
<body>
<div id="drag">
 <div class="title">
  <h2>这是一个可以拖动的窗口</h2>
  <div>
   <a class="min" href="javascript:;" title="最小化"></a>
   <a class="max" href="javascript:;" title="最大化"></a>
   <a class="revert" href="javascript:;" title="还原"></a>
   <a class="close" href="javascript:;" title="关闭"></a>
  </div>
 </div>
 <div class="resizeL"></div>
 <div class="resizeT"></div>
 <div class="resizeR"></div>
 <div class="resizeB"></div>
 <div class="resizeLT"></div>
 <div class="resizeTR"></div>
 <div class="resizeBR"></div>
 <div class="resizeLB"></div>
 <div class="content">
  ① 窗口可以拖动；<br />
  ② 窗口可以通过八个方向改变大小；<br />
  ③ 窗口可以最小化、最大化、还原、关闭；<br />
  ④ 限制窗口最小宽度/高度。
 </div>
</div>
</body>
</html>

希望本文所述对大家的JavaScript程序设计有所帮助。