$("#UlContent li").each(function (index) {
  // alert(index + ': ' + $(this).text());
  var text = $(this).text();
  var regExp = new RegExp($("#search_content").val(), 'g');
  var newText = text.replace(regExp,"<span style=\"background-color:red;\">" + $("#search_content").val() + "</span>");//将找到的关键字替换，加上highlight属性；
  $(this).text(newText);//更新文章；
});

$("#search_content").keyup(function () {
  if(CheckChinese($("#search_content").val()))
  {
   $.ajax({
    type: "POST",
    anync: true,
    url: "HelpCenterSuggestion.ashx",
    cache: false,
    dataType: "text",
    data: { m: $("#search_content").val() },
    success: function (result) {
     $("#UlContent li").remove();
      var regExp = new RegExp($("#search_content").val(), 'g');
      var newText = result.replace(regExp,"<span style=\"background-color:red;\">" + $("#search_content").val() + "</span>");//将找到的关键字替换，加上highlight属性；
      $("#UlContent").append(newText);
    }
   });