async / await

let time = () => {

    return new Promise((resolve,reject) => {

        setTimeout(() => {

          resolve('{"name":[1,2]}')

        },500)

    })

}

let fn = async () => {

    try{

        let objstr = await time();

        console.log(JSON.parse(objstr));

    }catch(e){

        throw new Error('对象字符串的 key 只能用双引号, 外部使用单引号')

    }

}

fn();

async await promise.png