JS获取鼠标坐标的实例方法

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

上面的代码在谷歌和搜狐浏览器中获取的值会不准确，需进行修改，如下：

var restrictX;  
var restrictY;  
var tip;  
// 鼠标坐标   
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  
    };  
}  
// 鼠标事件   
function mouseMove(ev){  
    ev = ev || window.event;  
    var mousePos = mousePosition(ev);  
    restrictX = mousePos.x;  
    restrictY = mousePos.y;  
}  
document.onmousemove = mouseMove;  
document.onclick = mouseMove; 

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

这两句为，如果能获取到鼠标坐标，则去前面，否则用后面的方法获取鼠标坐标，“|| ”后面的是给WebKit 内核的浏览器使用