//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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