Home Web Front-end JS Tutorial Summary of various jQuery example codes for traversing arrays and json objects

Summary of various jQuery example codes for traversing arrays and json objects

Jul 19, 2017 pm 01:58 PM
javascript jquery json

jquery grep() filters and traverses the array


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$().ready(

  function(){

    var array = [1,2,3,4,5,6,7,8,9];

    var filterarray = $.grep(array,function(value){

      return value > 5;//筛选出大于5的

    });

    for(var i=0;i<filterarray.length;i++){

      alert(filterarray[i]);

    }

    for (key in filterarray){

      alert(filterarray[key]);

    }

  }

);

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jquery each() filters and traverses the array


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$().ready(

  function(){

    var anObject = {one:1,two:2,three:3};//对json数组each

    $.each(anObject,function(name,value) {

      alert(name);

      alert(value);

    });

    var anArray = [&#39;one&#39;,&#39;two&#39;,&#39;three&#39;];

    $.each(anArray,function(n,value){

      alert(n);

      alert(value);

    }

    );

  }

);

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jquery inArray() filters and traverses the array


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$().ready(

  function(){

    var anArray = [&#39;one&#39;,&#39;two&#39;,&#39;three&#39;];

    var index = $.inArray(‘two&#39;,anArray);

    alert(index);//返回该值在数组中的键值,返回1

    alert(anArray[index]);//value is two

  }

);

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jquery map() filters and traverses the array


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$().ready(

  function(){

    var strings = [&#39;0&#39;,&#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;S&#39;,&#39;6&#39;];

    var values = $.map(strings,function(value){

        var result = new Number(value);

        return isNaN(result) ? null:result;//isNaN:is Not a Number的缩写

      }

    );

    for (key in values) {

      alert(values[key]);

    }

  }

);

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jquery traversal and parsing json object 1:


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var json = [{dd:&#39;SB&#39;,AA:&#39;东东&#39;,re1:123},{cccc:&#39;dd&#39;,lk:&#39;1qw&#39;}];

for(var i=0,l=json.length;i<l;i++){

  for(var key in json[i]){

    alert(key+&#39;:&#39;+json[i][key]);

  }

}

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jquery traverses and parses json objects 2


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//有如下 json对象:

var obj ={”name”:”冯娟”,”password”:”123456″,”department”:”技术部”,”sex”:” 女”,”old”:30};

//遍历方法:

for(var p in obj){

  str = str+obj[p]+&#39;,&#39;;

  return str;

}

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