关于js中对象和数组区别

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<script type="text/javascript">
    
    var str = '{"S190211500_1":{"text":"不会说不定是不是","harvest":"255","material_cost":"366","work_cost":"25","pic":"/fnb/uploads/image/a5/a538fa512e492aafae7e9cc045c3bc3b69995b59.jpg"},"S190211500_2":{"text":"是啊……不住","harvest":"236","material_cost":"3363","work_cost":"33","pic":"/fnb/uploads/image/a5/a538fa512e492aafae7e9cc045c3bc3b69995b59.jpg"},"S190211500_3":{"text":"一个人是谁吗","harvest":"25","material_cost":"25","work_cost":"66","pic":"/fnb/uploads/image/a5/a538fa512e492aafae7e9cc045c3bc3b69995b59.jpg"}}';
    var  object = JSON.parse(str);
    $(function(){
        //console.log(object);
        $.each(object, function(i,val){      
            $.each(val,function(j,value){    
                //console.log(j+" "+value);
            });
        }); 
    var  str2 = '{"S19011100010587_1":{"name":"地块1","arr":[{"index":"指标1","index_value":"地块1指标1描述"},{"index":"指标2","index_value":"地块1指标2描述"}]},"S19011100010587_2":{"name":"地块1","arr":[{"index":"指标1","index_value":"地块1指标1描述"},{"index":"指标2","index_value":"地块1指标2描述"}]}}';
    var  object2 = JSON.parse(str2);
    //console.log(object2);
    $.each(object2,function(k2,v2){
        //console.log(k2+" "+v2.arr[0]['index']);
        //遍历获取指标和地块描述
        //$.each()
        //console.log(v2.arr);
        var  ArrayObject  =  v2.arr;
        //console.log(ArrayObject);
        for(var  k3 in ArrayObject ){
            //console.log(ArrayObject[k3]['index']);//指标1,指标2
            //console.log(ArrayObject[k3]['index_value']);//指标1描述,指标2描述
        }
    });
    //json 里面套数组,对象里面必须含有key这个值
    var aa = {"a":[1,2,3]};
    //var bb  ={4,5,6};   错误定义对象方法
    //var  bb = {[4,5,6]};错误定义对象方法
    //console.log(aa.a[0]);//1
    //console.log(aa.a.length);//3
    //数组里面套json
    var  cc = [{"a_k":"b_v","b_k":"b_v","c_k":"c_v"}];
    console.log(cc.length);//1
    console.log(cc[0]["a_k"]);//b_v
    console.log(cc[0].a_k);//b_v
});
</script>

 

$str = '{"a":[{"c":"c1"},{"c":"c1"}]}'; 这是正确格式

转载于:https://my.oschina.net/hongjiang/blog/3013571