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[Java教程]javascript实现的查询json实例代码


javascript实现的查询json实例代码:
下面是一段网络上的比较好的javascript查询json的代码实力片段,希望能够给需要的有所帮助。
代码实例如下:

 

/*     * 定义模板函数    */    var template = function (queryArr) {      var count = 0;      for (var i = 0; i < queryArr.length; i++) {        var e = queryArr[i];        if ($express) {          count++;        }      }      return count;    }    /*     * 模板创建函数    */    var createIntance = function (exp) {      var fun = template.toString().replace("$express", exp).toString();      return eval("0," + fun);    }    var testTodo = function () {      var testArr = [        { name: "张三", age: 20 },        { name: "李四", age: 25 },        { name: "王二麻子", age: 28 },        { name: "小张", age: 30 }      ];      var func = createIntance("e.age>=25");      alert(func(testArr));    }    /****************** JS 实现 JSON查询 **********************/</P>    // 定义常用的函数    var len = function (s) { return s.length; }    var left = function (s, n) { return s.substr(0, n); }    var right = function (s, n) { return s.substr(-n); }    var index = function (s, find) { return s.indexOf(find) + 1; }    // 扩展原型方法    var _proto = Object.prototype;    // 缓存,解决快速查找    var _cache = {};    // 扩展运算符    var _alias = [      /@/g, "_e.",      /AND/gi, "&&",      /OR/gi, "||",      /<>/g, "!=",      /NOT/gi, "!",      /([^=<>])=([^=]|$)/g, '$1==$2'    ];    var _rQuote = /""/g;    var _rQuoteTemp = /!~/g;    // 编译    var _complite = function (code) {      return eval("0," + code);    }    // 将扩展符号转换成标准的JS符号    var _interpret = function (exp) {      exp = exp.replace(_rQuote,"!~");      var arr = exp.split('"');      var i, n = arr.length;      var k = _alias.length;      for (var i = 0; i < n; i += 2) {        var s = arr[i];        for (var j = 0; j < k; j += 2) {          if (index(s, _alias[j]) > -1) {            s = s.replace(_alias[j], _alias[j + 1]);          }        }        arr[i] = s;      }      for (var i = 1; i < n; i += 2) {        arr[i] = arr[i].replace(_rQuoteTemp, '\\"');      }      return arr.join('"');    }    // 定义模函数    var _templ = function (_list) {      var _ret = [];      var _i = -1;      for (var _k in _list) {        var _e = _list[_k];        if (_e != _proto[_k]) {          if ($C) {            _ret[++_i] = _e;          }        }      }      return _ret;    } .toString();    // 扩展查询的方法    _proto.Query = function (exp) {      if (!exp) {        return [];      }      var fn = _cache[exp];      try {        if (!fn) {          var code = _interpret(exp);          code = _templ.replace("$C", code);          fn = _cache[exp] = _complite(code);        }        return fn(this);      } catch (e) {        return [];      }    }    var doTest = function () {      var heros = [      // 名============攻=====防=======力量====敏捷=====智力====        {name: '冰室女巫', DP: 38, AP: 1.3, Str: 16, Dex: 16, Int: 21 },        { name: '沉默术士', DP: 39, AP: 1.1, Str: 17, Dex: 16, Int: 21 },        { name: '娜迦海妖', DP: 51, AP: 6.0, Str: 21, Dex: 21, Int: 18 },        { name: '赏金猎人', DP: 39, AP: 4.0, Str: 17, Dex: 21, Int: 16 },        { name: '剧毒术士', DP: 45, AP: 3.1, Str: 18, Dex: 22, Int: 15 },        { name: '光之守卫', DP: 38, AP: 1.1, Str: 16, Dex: 15, Int: 22 },        { name: '炼金术士', DP: 49, AP: 0.6, Str: 25, Dex: 11, Int: 25 }      //...      ];      var match = heros.Query('@Str>20 AND @Dex>20');      ShowResult(match[0]);</P>      // 查询:“士”结尾的      // 结果:沉默术士,剧毒术士,炼金术士      var match = heros.Query('right(@name,1)="士"');      ShowResult(match[0]);    }    function ShowResult(result) {      alert(result.name + " " + result.DP + " " + result.AP + " " + result.Str + " " + result.Dex + " " + result.Int);    }

 

原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=8180

更多内容可以参阅 :http://www.softwhy.com/javascript/