//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 */