字符串与数组之间的互相转换

将对象或者数组或者对象数组转换成字符串------JSON.stringify

    let obj= {name:'ming',age:18}
    console.log(JSON.stringify(obj));
     
     let obj= [{name:'ming',age:18},{name:'wang',age:19}]
     console.log(JSON.stringify(obj));

将字符串转回数组-------JSON.parse( str)

       let str= '{"name":"ming","age":18},{"name":"wang","age":19}'
       console.log(JSON.parse(str));