//获取鼠标点击的像素坐标
function mouseClick(e){ 
        var x,y; 
        var e = e||window.event; 
        x = e.clientX+document.body.scrollLeft+document.documentElement.scrollLeft;
        y = e.clientY+document.body.scrollTop+document.documentElement.scrollTop;
        console.log(x+","+y);
        return { 
            x:x, 
            y:y 
        }; 
    }; 

viewer.click(function(event){
        var windowPosition = mouseClick(event);
        console.log(windowPosition);
    });