var restrictX;  
var restrictY;  
var tip;  
// 鼠標坐標   
function mousePosition(ev) {  
return {  
        x : ev.clientX + document.documentElement.scrollLeft - document.documentElement.clientLeft,  
        y : ev.clientY + document.documentElement.scrollTop - document.documentElement.clientTop  
    };  
}  
// 鼠標事件   
function mouseMove(ev) {  
    ev = ev || window.event;  
    var mousePos = mousePosition(ev);  
    restrictX = mousePos.x;  
    restrictY = mousePos.y;  
}  
document.onmousemove = mouseMove;  
document.onclick = mouseMove;  

上面的代碼在谷歌和搜狐瀏覽器中獲取的值會不準確，需進行修改，如下：

復制代碼代碼如下:

var restrictX;  
var restrictY;  
var tip;  
// 鼠標坐標   
function mousePosition(ev){  
    var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;  
    var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;  
    return {  
        x:ev.clientX + scrollLeft - document.documentElement.clientLeft,  
        y:ev.clientY + scrollTop - document.documentElement.clientTop  
    };  
}  
// 鼠標事件   
function mouseMove(ev){  
    ev = ev || window.event;  
    var mousePos = mousePosition(ev);  
    restrictX = mousePos.x;  
    restrictY = mousePos.y;  
}  
document.onmousemove = mouseMove;  
document.onclick = mouseMove;  

復制代碼代碼如下:

var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;  

這兩句為，如果能獲取到鼠標坐標，則去前面，否則用后面的方法獲取鼠標坐標，“|| ”后面的是給WebKit 內核的瀏覽器使用

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