问NodeJS + jsDom同步调用

EN

var jsdom = require("jsdom");
var fs = require("fs");
var jquery = fs.readFileSync("./jquery.js").toString();

var fields = ['http://some.url/page.html']

for(var b=0, len = fields.length;b<len;b++){

jsdom.env({
      html: fields[b],
      src: [jquery],
      done: function (errors, window) {
            var $ = window.$;
            $("div.pager a").each(function() {
                //Push new finded hyperlinks in array
              fields.push($(this).attr('href'));
            });

        }
    });
    //recalculate actual length of array to make more loop
    len=fields.length;
}