var mouseX, mouseY;

var objX, objY;

var isDowm = false;  //是否按下鼠标

function mouseDown(obj, e) {

obj.style.cursor = "move";

objX = div1.style.left;

objY = div1.style.top;

mouseX = e.clientX;

mouseY = e.clientY;

isDowm = true;

}

function mouseMove(e) {

var div = document.getElementById("div1");

var x = e.clientX;

var y = e.clientY;

if (isDowm) {

div.style.left = parseInt(objX) + parseInt(x) - parseInt(mouseX) + "px";

div.style.top = parseInt(objY) + parseInt(y) - parseInt(mouseY) + "px";

document.getElementById("span1").innerHTML = "x:" + div.style.top + "  " + "y:" + div.style.left;

}

}

function mouseUp(e) {

if (isDowm) {

var x = e.clientX;

var y = e.clientY;

var div = document.getElementById("div1");

div.style.left = (parseInt(x) - parseInt(mouseX) + parseInt(objX)) + "px";

div.style.top = (parseInt(y) - parseInt(mouseY) + parseInt(objY)) + "px";

document.getElementById("span2").innerHTML = "x:" + div.style.top + "  " + "y:" + div.style.left;

mouseX = x;

rewmouseY = y;

div1.style.cursor = "default";

isDowm = false;

}

}