js检测网络是否连通

varEventUtil={

addHandler:function(element,type,handler){

if(element.addEventListener){

element.addEventListener(type,handler,false);

}elseif(element.attachEvent){

element.attachEvent("on"+type,handler);

}else{

element["on"+type]=handler;

}

},

removeHandler:function(element,type,handler){

if(element.removeEventListener){

element.removeEventListener(type,handler,false);

}elseif(element.detachEvent){

element.detachEvent("on"+type,handler);

}else{

element["on"+type]=null;

}

}

};

vardom=document.createElement('img');

dom.style='display:none;';

dom.src='http://www.baidu.com/img/bdlogo.gif';

dom.id='map_img';

EventUtil.addHandler(dom,'error',function(){

alert('你的电脑没有链接网络，连接上网络后才能打开地图！');

});

document.body.appendChild(dom);