$.fn.append2 = function(html, callback) {
var originalHtmlLength = $("body").html().length;
this.append(html);
var nums = 1;
var timer1 = setInterval(function() {
nums++;
var clearIntervalfun = function() {
clearInterval(timer1)
callback();
}
var flag = originalHtmlLength != $("body").html().length || nums > 1000;
// console.info("append html expend {0}ms".format(nums))
flag && clearIntervalfun() }, 1)
};