JavaScript获取鼠标点击坐标

function mouseMove(ev) {    
    Ev = ev || window.event;    
    var mousePos = mouseCoords(ev);    
    console.log('点击位置： (x: ' + mousePos.x + ' y: ' + mousePos.y + ')');
}
function mouseCoords(ev) {   
 if (ev.pageX || ev.pageY) {        
    return {x: ev.pageX, y: ev.pageY};    
}   
 return {        
    x: ev.clientX + document.body.scrollLeft - document.body.clientLeft,        
    y: ev.clientY + document.body.scrollTop - document.body.clientTop    
};
}
document.onclick = mouseMove;