C# javascript 查找字体突出显示（改变大小、颜色）

启动类：Program.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace FontColor
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frmColorWords());
        }
    }
}

查找类：frmColorWords.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Collections;

namespace FontColor
{
    public partial class frmColorWords : Form
    {
        ArrayList list = new ArrayList();
        public frmColorWords()
        {
            InitializeComponent();
        }

        //索引单词
        private void btnSearch_Click(object sender, EventArgs e)
        {
            if (this.rtxtText.Text.Equals(""))
            {
                MessageBox.Show("请先加载要索引的文本！", "消息");
                this.btnLoadText.Focus();
                return;
            }

            if (this.txtSearchWords.Text.Equals(""))
            {
                MessageBox.Show("请输入您要索引的单词！", "消息");
                this.txtSearchWords.Focus();
                return;
            }

            int place = 0;
            this.rtxtText.SelectAll();
            this.rtxtText.SelectionColor = Color.Black;
            this.rtxtText.SelectionFont = new Font("宋体", 9);
            string text = " " + this.rtxtText.Text.ToLower() + " ";
            string word = this.txtSearchWords.Text.ToLower().Trim();
            int s = 0;//单词出现的个数
            if (text.IndexOf(word, place + 1) == -1)
            {
                MessageBox.Show("没有找到！");
            }
            else
            {
                try
                {
                    for (int i = 0; i < text.Length; i++)
                    {
                        int start = text.IndexOf(word, place + 1);
                        if (start == -1)
                        {
                            MessageBox.Show("索引单词 " + word + " 完毕！\n总共索引到 " + s + " 处！", "消息");
                            break;
                        }
                        string front = text.Substring(start - 1, 1);
                        string back = text.Substring(start + word.Length, 1);
                        if (list.Contains(front) && list.Contains(back))
                        {
                            s++;
                            this.rtxtText.Select(start - 1, word.Length);
                            this.rtxtText.SelectionColor = Color.Blue;
                            this.rtxtText.SelectionFont = new Font("Blod", 15);
                        }
                        place = start;
                    }
                }
                catch { }
            }
        }

        //加载文本
        private void btnLoadText_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
            if (openFile.ShowDialog() == DialogResult.OK)
            {
                this.rtxtText.Clear();
                string fileName = openFile.FileName;
                this.rtxtText.LoadFile(fileName, RichTextBoxStreamType.PlainText);
                this.txtSearchWords.Focus();
            }
        }

        //退出
        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        //界面加载
        private void frmColorWords_Load(object sender, EventArgs e)
        {
            string[] str = { " ", "!", ",", "@", "#", "$", ";", ":", "(", ")", "_", "+", "-", "*", "/", "?", "<", ">", "/", "\\", "{", "}", "?", "=", "&", "%", "~", ".", "\"", "\'", "[", "]" };
            for (int i = 0; i < str.Length; i++)
            {
                list.Add(str[i]);
            }
        }
    }
}

-----javascript:
    高亮显示查询字符

// JavaScript Document
function WordHight(){
   var obj = document.getElementById("objContent");
   if(obj){
    var div = document.getElementById("objContent");
    if(document.getElementById("KeyWord"));
    var keyWord=document.getElementById("KeyWord").value;
    MarkHighLight(div,keyWord);
   }
}
 /*----------------------------------------*\
 * 使用 js 标记高亮关键词 by markcxz(markcxz@aol.com)
 * 参数说明:
 * obj: 对象, 要进行高亮显示的html标签节点.
 * hlWords: 字符串, 要进行高亮的关键词词, 使用 竖杠(|)或空格分隔多个词 .
 * cssClass: 字符串, 定义关键词突出显示风格的css伪类.
 * 参考资料: javascript HTML DOM 高亮显示页面特定字词 By shawl.qiu
\*----------------------------------------*/
function MarkHighLight(obj,hlWords,cssClass){

 hlWords=AnalyzeHighLightWords(hlWords);
 
 if(obj==null || hlWords.length==0)
  return;
 if(cssClass==null)
  cssClass="highlight";
 MarkHighLightCore(obj,hlWords);
 
 //------------执行高亮标记的核心方法----------------------------
 function MarkHighLightCore(obj,keyWords){
  var re=new RegExp(keyWords, "i");
  
  for(var i=0; i<obj.childNodes.length; i++){
  
   var childObj=obj.childNodes[i];
   if(childObj.nodeType==3){
    if(childObj.data.search(re)==-1)continue;
    var reResult=new RegExp("("+keyWords+")", "gi");
    var objResult=document.createElement("span");
    objResult.innerHTML=childObj.data.replace(reResult,"<span class='"+cssClass+"'>$1</span>");                    
    if(childObj.data==objResult.childNodes[0].innerHTML) continue;
    obj.replaceChild(objResult,childObj);                                     
   }else if(childObj.nodeType==1){
    MarkHighLightCore(childObj,keyWords);
   }
  }
 }       
 
 //----------分析关键词----------------------
 function AnalyzeHighLightWords(hlWords){
  if(hlWords==null) return "";
  hlWords=hlWords.replace(/\s+/g,"|").replace(/\|+/g,"|");           
  hlWords=hlWords.replace(/(^\|*)|(\|*$)/g, "");
  
  if(hlWords.length==0) return "";
  var wordsArr=hlWords.split("|");
  
  if(wordsArr.length>1){
   var resultArr=BubbleSort(wordsArr);
   var result="";
   for(var i=0;i<resultArr.length;i++){
    result=result+"|"+resultArr[i];
   }               
   return result.replace(/(^\|*)|(\|*$)/g, "");
 
  }else{
   return hlWords;
  }
 }   
 
 //-----利用冒泡排序法把长的关键词放前面-----   
 function BubbleSort(arr){       
  var temp, exchange;   
  for(var i=0;i<arr.length;i++){           
   exchange=false;               
   for(var j=arr.length-2;j>=i;j--){               
    if((arr[j+1].length)>(arr[j]).length){                   
     temp=arr[j+1]; arr[j+1]=arr[j]; arr[j]=temp;
     exchange=true;
    }
   }               
   if(!exchange)break;
  }
  return arr;           
 }

}