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  • linq to js使用汇总

    用途:方便js操作查询json数据。

    下载网址:http://jslinq.codeplex.com/

    使用方法:只需要引用linq.js即可。

    查询方法:

    一、where查询

    var myList = [
      { Name: "Jim", Age: 20 },
      { Name: "Kate", Age: 21 },
      { Name: "Lilei", Age: 18 },
      { Name: "John", Age: 14 },
      { Name: "LinTao", Age: 25 }
    ];
    var arrRes = Enumerable.From(myList).Where("x=>x.Name=='Jim'").ToArray();
    

    二、排序:OrderBy

    var myList = [
      { Name: "Jim", Age: 20 },
      { Name: "Kate", Age: 21 },
      { Name: "Lilei", Age: 18 },
      { Name: "John", Age: 14 },
      { Name: "LinTao", Age: 25 }
    ];
    var arrRes = Enumerable.From(myList).OrderBy("x=>x.Age").ToArray();//降序OrderByDescending()
    

     

    三、去重:Distinct

    var myList = [
      { Name: "Jim", Age: 20 },
      { Name: "Kate", Age: 20 },
      { Name: "Lilei", Age: 20 },
      { Name: "John", Age: 14 },
      { Name: "LinTao", Age: 25 }
    ];
    var arrRes = Enumerable.From(myList).Distinct("x=>x.Age").ToArray();
    

    四、遍历:ForEach

    var myList = [
      { Name: "Jim", Age: 20 },
      { Name: "Kate", Age: 20 },
      { Name: "Lilei", Age: 20 },
      { Name: "John", Age: 14 },
      { Name: "LinTao", Age: 25 }
       ];
       Enumerable.From(myList).ForEach(function(value, index){
            document.write("值="+value+",索引="+index);   
    });
    

    五、取唯一对象:First、FirstOrDefault、Last、LastOrDefault、Single、SingleOrDefault

    var myList = [
      { Name: "Jim", Age: 20 },
      { Name: "Kate", Age: 20 },
      { Name: "Lilei", Age: 20 },
      { Name: "John", Age: 14 },
      { Name: "LinTao", Age: 25 }
    ];
    var arrRes = Enumerable.From(myList).FirstOrDefault("x=>x.Age>18");
    

     

    六、Skip、Take

    Enumerable.Range(1,10).Skip(5)//结果[6,7,8,9,10]
    Enumerable.Range(1,10).Take(5)//结果[1,2,3,4,5]
    

      

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  • 原文地址:https://www.cnblogs.com/vipstone/p/5588020.html
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