(function () { var _data = []; var Queryable = function (data) { if (data instanceof Array) { _data = data; } else { throw "Queryable不支持非数组类型"; } } Queryable.prototype.forEach = function (callback) { for (var obj in _data) { callback(_data[obj]); } } Queryable.prototype.sum = function (selector) { if (typeof selector !== "function") return; var s = 0; this.forEach(x => { s += selector(x); }); return s; } Queryable.prototype.max = function (selector) { if (typeof selector !== "function") return; var max = undefined; this.forEach(x => { var v = selector(x) max = max > v ? max : (max = v); }); return max; } Queryable.prototype.min = function (selector) { if (typeof selector !== "function") return; var min = undefined; this.forEach(x => { var v = selector(x) min = min < v ? min : (min = v); }); return min; } Queryable.prototype.where = function (selector) { if (typeof selector !== "function") return; var arrry = []; this.forEach(x => { if (selector(x)) { arrry.push(x); } }); return new Queryable(arrry); } Queryable.prototype.toArray = function () { var array = [] for (var i = 0; i < _data.length; i++) { array.push(_data[i]); } return array; } Queryable.prototype.elementAt = function (index) { return _data[index]; } Queryable.prototype.indexOf = function (elm) { return _data.indexOf(elm); } Queryable.prototype.remove = function (item) { var index = this.indexOf(item); if (index > -1) { _data.splice(index, 1); } } Queryable.prototype.findOne = function (selector) { if (typeof selector !== "function") return undefined; for (var obj in _data) { if (selector(_data[obj])) { return _data[obj]; } } return undefined; } Queryable.prototype.select = function (selector) { if (typeof selector !== "function") this; var array = []; for (var obj in _data) { array.push(selector(_data[obj])); } return new Queryable(array); } Queryable.prototype.orderBy = function (selector) { if (typeof selector !== "function") return this; var compare = function (a, b) { return selector(a) > selector(b) ? 1 : -1; } _data.sort(compare); return this; } Queryable.prototype.orderByDesc = function (selector) { if (typeof selector !== "function") return this; var compare = function (a, b) { return selector(a) > selector(b) ? -1 : 1; } _data.sort(compare); return this; } Queryable.prototype.all = function (predicate) { if (typeof predicate !== "function") throw "参数类型错误"; for (let item of _data) { if (predicate(item) === false) return false; } return true; } Queryable.prototype.any = function (predicate) { if (typeof predicate !== "function") throw "参数类型错误"; for (let item of _data) { if (predicate(item)) return true; } return false; } Queryable.prototype.add = function (item) { _data.push(item); return this; } Queryable.prototype.addOrUpdate = function (item) { var index = this.indexOf(item); if (index > -1) _data[index] = item; else { this.add(item); } return this; } window.Linq = { from: function (data) { return new Queryable(data); } };})();测试：
var myData = [{ name: 'a', number: 1 }, { name: 'b', number: 2 }, { name: 'e', number: 5 }, { name: 'c', number: 3 }, { name: 'd', number: 4 }];console.log("min:" + Linq.from(myData).min(function (x) { return x.number }));console.log("findOne:" + Linq.from(myData).findOne(function (x) { return x.number == 2 }));| 留言与评论（共有 0 条评论） “” |
