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这篇文章主要介绍了javascript实现的元素拖动，将相应的元素对象的引用传到函数中。

//宿主为浏览器 

//将相应的元素对象的引用传到函数中 

function candrag(drager) {

  drager.onmousedown = function (down) {

    var offx = drager.offsetLeft

    var offy = drager.offsetTop;

    var offxl = down.clientX - offx;

    var offyl = down.clientY - offy;

    window.condition = 0;//为window添加了condition属性，用于解决和click之间的矛盾 

    document.onmousemove = function (move) {

      drager.style.left = move.clientX - offxl + "px";

      drager.style.top = move.clientY - offyl + "px";

      drager.style.cursor = "move";

      condition = Math.abs(move.clientX - down.clientX) + Math.abs(move.clientY - down.clientY);

    }

  }

  drager.onmouseup = function () {

    document.onmousemove = null;

    draggerr.style.cursor = "auto";

  }

}

/*对于和click之间的矛盾解决，需要判断condition

*例如：

candrag(dragger);

d01.onclick = function () {

  if (!condition) {

    d01.style.backgroundColor = "red";

  }

}

*其中，d01为dragger的子元素

*/

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