How to convert array to json format in javascript

In javascript, you can use the conversion function "JSON.stringify()" to convert the array into json format. The syntax format is "JSON.stringify(array)"; this function can convert arrays or objects. Then return a string containing the JSON text.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript array to JSON format

Point 1: Conversion function JSON.stringify()

Point 2: When writing an array in js var data = new Array() But if you want to convert to json for display, you must write var data = {}, otherwise the converted json will be empty.

First look at an incorrect format:

<script>
    //定义一个数组
    var data = new Array();
    for (var i = 0; i < 5; i++) {
 
    //定义一个二维数组
    data[i] = new Array();
 
    data[i][&#39;day&#39;] = &#39;2018-06-01&#39;;
    data[i][&#39;time_data&#39;] = &#39;数据&#39;;
    }
 
    //打印数组
    console.log(data);
 
    //转换json打印
    var res = JSON.stringify(data);
    console.log(res);
 
</script>

Effect:

## Correct format:

<script>
    //定义一个数组 这里我们吧new Array()换成{}的形式
    var data = {};

    for (var i = 0; i < 5; i++) {

//定义一个二维数组
data[i] = {};

data[i][&#39;day&#39;] = &#39;2018-06-01&#39;;
data[i][&#39;time_data&#39;] = &#39;数据&#39;;
    }

    //打印数组
    console.log(data);

    //转换json打印
    var res = JSON.stringify(data);
    console.log(res);

</script>

Result:

Summary: It can be seen that what we define is actually an object format. var data = {} is the abbreviation of var data = new Object(). JSON.stringify() cannot convert an array with custom subscripts. It can convert an array with 0 1 2 subscripts. Of course, that may not be what you want.

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