Conversion between JS objects and JSON in Javascript

1.JSON.stringify()：js object->json

  <script>
         //Number
        console.log(JSON.stringify(3.14));
        //字符串
        console.log(JSON.stringify(&#39;php.cn&#39;));
        //布尔型
        console.log(JSON.stringify(true));
        console.log(JSON.stringify(null));
        //对象
        console.log(JSON.stringify({x:&#39;a&#39;,y:&#39;b&#39;}));
        //数组
        console.log(JSON.stringify([1,2,3]));
  </script>

2.JSON.parse(): json->js object

    <script>
        console.log(JSON.parse(
            `{
                "a":1,
                "b":2,
                "c":3
            }`
        ));
        console.log(typeof JSON.parse(
            `{
                "a":1,
                "b":2,
                "c":3
            }`));
        let jsObj=JSON.parse(`{"a":1,"b":2,"c":3}`);
        //判断是否为Object
        console.log(jsObj instanceof Object);
        console.log(typeof jsObj);
        //promise fetch
    </script>

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