其实很简单，我这部分代码，前一部分是简单的实现如何使用JS写模板，第二个就是具体的实现了JSON查询的一个扩展。

以后查询Json就有了利器了。

复制代码 代码如下:

/*

* 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 **********************/

// 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]);

// 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);

}

代码就是这样了。欢迎大家拍砖，或者可以提出新的想法。我们一起来扩展