js鼠标点击弹出层点击其它地方消失

 window.onload = function(){
            document.onclick = function(e){
                e = e || window.event;
                var dom =  e.srcElement|| e.target;
                if(dom.id != "boxweixin" && document.getElementById("boxweixin").style.display == "block") {
                    document.getElementById("boxweixin").style.display = "none";
                }
            };
        };
        function openDialog(e) {
            document.getElementById("boxweixin").style.display = "block";
            e = e||window.event;
            if(+'\v1') {
                e.stopPropagation();
            } else  {
                e.cancelBubble = true;
            }
             
        }