QQ群成员提取

var ids    = document.querySelectorAll(".member_id");
var names  = document.querySelectorAll(".member_name");
var output = "", length = ids.length;
for(var i=0; i<length; i++){output += ids[i].innerHTML.slice(1,-1) + ":" + names[i].innerHTML + "
";}

console.log(output);