es6 promise读取文件

promise读取文件

//js文件
<script>
    const fs = require('fs');


    // fs.readFile("./test1.txt", function (err, data) {
    //     if(err) throw err;
    //     console.log(data.toString());
    // });

    //promise 封装

    const p = new Promise(function (resolve, reject) {
        fs.readFile("./test1.txt", function (err, data) {
            if(err) reject(err);
            resolve(data);
        });
    });

    p.then(
        value => {
            console.log(value.toString());
        },
        reason => {
            console.log(reason);
        }
    )
</script>