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這篇文章主要介紹了javascript實現的元素拖動，將相應的元素對象的引用傳到函數中。

//宿主為瀏覽器 

//將相應的元素對象的引用傳到函數中 

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;//為window添加了condition屬性，用于解決和click之間的矛盾 

    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";

  }

}

/*對于和click之間的矛盾解決，需要判斷condition

*例如：

candrag(dragger);

d01.onclick = function () {

  if (!condition) {

    d01.style.backgroundColor = "red";

  }

}

*其中，d01為dragger的子元素

*/

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