var n=$('#groupMember .list tr.mb');
var t='QQ\t昵称\t群名片\n';
for(var i=0;i<n.length;i++) {
var nn = n.children[2].children[2].innerText;
var mp = n.children[3].children[0].innerText;
var qq = n.children[4].innerText;
t += qq + &#39;\t&#39;+ nn.trim() + &#39;\t&#39; + mp.trim() + &#39;\n&#39;;
}
console.log(t);