Question

我是初学者，请帮助我从下面的数组json对象中获取价值。

[{"Category":"HI","Sub Category":"AQ HIOP"},
{"Category":"2HJ","Sub Category":"AS HIOP"},
{"Category":"3HJ","Sub Category":"AT HIOP"},
{"Category":"4Hj","Sub Category":"AP HIOP"},
{"Category":"5HJ","Sub Category":"AN HIOP"},
]

我只需要Sub Category的值

谢谢。

Answer 1

您可以通过多种方式进行操作。如果您的对象包含在变量中，则可以这样访问：

var test = [{"Category":"HI","Sub Category":"AQ HIOP"},
{"Category":"2HJ","Sub Category":"AS HIOP"},
{"Category":"3HJ","Sub Category":"AT HIOP"},
{"Category":"4Hj","Sub Category":"AP HIOP"},
{"Category":"5HJ","Sub Category":"AN HIOP"},
]

test[0]["Sub Category"] //Take into account that you have an array

如果密钥中没有空格，可以这样访问：

test[0].Category;

如果您的JSON是字符串，则必须先使用JSON.parse。

编辑

这里您将如何插入新数组

var another_array = []
another_array.push({"New category": test[0]["Sub Category"]})

Answer 2

尝试一下：

var arr = [{"Category":"HI","Sub Category":"AQ HIOP"},
    {"Category":"2HJ","Sub Category":"AS HIOP"},
    {"Category":"3HJ","Sub Category":"AT HIOP"},
    {"Category":"4Hj","Sub Category":"AP HIOP"},
    {"Category":"5HJ","Sub Category":"AN HIOP"},
    ]
    for (var i = 0; i < arr.length; i++) {
    	for (key in arr[i]) {
    		console.log('Key: '+ key + ' Value: ' + arr[i][key]);
    	}
    }

您可以使用for和for in访问您的Objet

Answer 3

var test = [
{"Category":"HI","Sub Category":"AQ HIOP"},
{"Category":"2HJ","Sub Category":"AS HIOP"},
{"Category":"3HJ","Sub Category":"AT HIOP"},
{"Category":"4Hj","Sub Category":"AP HIOP"},
{"Category":"5HJ","Sub Category":"AN HIOP"},
];
test.forEach(function(item){
    console.log(item);
})

如何从数组json对象访问值-javascript

3 个答案:

编辑