js敏感詞過濾

var filterWord={

    words:"",

    tblRoot:{},

    //敏感詞檔案

    file:"sensitiveWords.txt",

    //載入敏感片語

    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);

    },

    //將關鍵字生成一顆樹

    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];

                    //完成當前關鍵字

                    if (key == ';'){

                        tblCur.end = true;

                        tblCur = this.tblRoot;

                        continue;

                    }

                    //生成子節點

                    if (key in tblCur)

                        tblCur = tblCur[key];

                    else

                        tblCur = tblCur[key] = {};

                }

                //最後一個關鍵字沒有分割符

                tblCur.end = true;

                callback(this.tblRoot);

            });

        }else{

            callback(this.tblRoot);

        }

    },

    //標記出內容中敏感詞的位置

    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;

    },

    //標記敏感字

     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);

         });

     }

 };

filterWord.handle("徐航撒颯颯阿薩颯颯劉孝朋啊啊撒颯颯")