js偵測網路是否具體連接功能的程式碼_javascript技巧

複製程式碼 程式碼如下:

var EventUtil = {
adddler: function (Handler: function (Handler: function, handler) {
if (element.addEventListener) {
element.addEventListener(type, handler, false);
} else if (element.attachEvent) {
element.attachEvent("on" type , handler);
} else {
element["on" type] = handler;
}
},
removeHandler: function (element, type, handler) {
removeHandler: function (element, type, handler) {
if (element.removeEventListener) {
element.removeEventListener(type, handler, false);
} else if (element.detachEvent) {
element.detachEvent("on" type, handler); } else {
element["on" type] = null;
}
}
};

var dom = 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('你的電腦沒有連結網絡，連接上網絡後才能打開地圖！');
});
document.body.appendChild(dom);