var openWindow = function(url, options) {
var str = "";
if (options) {
options.height = options.height || 420;
options.width = options.width || 550;
options.left = options.left || ((screen.width - options.width) / 2); //默认为居中
options.top = options.top || ((screen.height - options.height) / 2); //默认为居中

for (var i in options) {
str += ',' + i + '=' + options[i];
}
str = str.substr(1);
};
window.open(url, 'connect_window_'+ (+new Date), str);//参数1为url,参数2为了能可以重复弹出
str = null;
};


//demo 1:新窗口打开我的led投光灯电源网站
document.body.onclick = function(){
openWindow("http://www.daermay.com/ ?rel=xuexb");
}

//demo 2:固定宽 并居中
document.body.onclick = function(){
openWindow("http://www.jb51.net/ ?rel=xuexb",{
width:888
});
}