下面是js简单的一个promise对象实例
// promise.js
let myFirstPromise = new Promise(function(resolve, reject){
let x = 1;
//let x = 6;
if(x>3)
resolve(`${x} > 3, succ`);
else
reject(`${x} < 3 fail`);
});
myFirstPromise.then(function(succMsg){
console.log(succMsg); // succMsg 参数 是 resolve 返回的内容
}).catch(function(failMsg){
console.log(failMsg); // failMsg 参数是 reject 返回的内容
});
运行结果
$ node promise.js
1 < 3 fail
参考： https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Promise
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