js敏感词过滤

var filterWord={
    words:"",
    tblRoot:{},
    //敏感词文件
    file:"sensitiveWords.txt",

    //载入敏感词组
    load:function (file,callback) {
     file=file||this.file;
     var objHttp;
     if (window.ActiveXObject) {
         objHttp = new ActiveXObject("Microsoft.XMLHTTP");
     }else {
         objHttp = new XMLHttpRequest();
         objHttp.overrideMimeType("text/xml");
     }

     objHttp.onreadystatechange = function () {
         if (objHttp.readyState != 4)
             return;
         this.words = objHttp.responseText;
         callback(objHttp.responseText);
     };

     objHttp.open("GET", file, true);
     objHttp.send(null);
    },

    //将关键字生成一颗树
    makeTree:function (callback) {
        if(this.words==""){
            this.load(this.file,function (words) {
                var strKeys = words;
                var arrKeys = strKeys.split("");
                var tblCur = this.tblRoot = {};
                var key;

                for (var i = 0, n = arrKeys.length; i < n; i++) {
                    key = arrKeys[i];
                    //完成当前关键字
                    if (key == ';'){
                        tblCur.end = true;
                        tblCur = this.tblRoot;
                        continue;
                    }
                    //生成子节点
                    if (key in tblCur)
                        tblCur = tblCur[key];
                    else
                        tblCur = tblCur[key] = {};
                }

                //最后一个关键字没有分割符
                tblCur.end = true;
                callback(this.tblRoot);
            });
        }else{
            callback(this.tblRoot);
        }
    },

    //标记出内容中敏感词的位置
    searchWords:function (content,root) {
        var tblCur,p, v,i = 0,arrMatch = [];
        var n = content.length;
        while (i < n) {
            tblCur = root;
            p = i;
            v = 0;

            for (; ;) {
                if (!(tblCur = tblCur[content.charAt(p++)])) {
                    i++;
                    break;
                }
                //找到匹配敏感字
                if (tblCur.end)
                    v = p;
            }
            //最大匹配
            if (v){
                arrMatch.push(i - 1, v);
                i = v;
            }
        }
        return arrMatch;
    },

    //标记敏感字
     handle:function (strContent) {
         var mid,arrMatch,strHTML,arrHTML = [],p = 0;
         this.makeTree(function (data) {
             arrMatch = filterWord.searchWords(strContent,data);
             for (var i = 0, n = arrMatch.length; i < n; i += 2) {
                 mid = arrMatch[i];
                 arrHTML.push(strContent.substring(p, mid),
                     "<em>",
                     strContent.substring(mid, p = arrMatch[i + 1]),
                     "</em>");
             }
             arrHTML.push(strContent.substring(p));

             strHTML = arrHTML.join("").replace(/\n/g, "<br>");
             console.log(strHTML);
         });
     }
 };

使用方式：

filterWord.handle("徐航撒飒飒阿萨飒飒刘孝朋啊啊撒飒飒")