Node.js中, 使用Q.ninvoke封装对象方法为promise

lslxdx

于 2016-06-15 11:52:07 发布

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分类专栏： Nodejs 文章标签： node.js

本文链接：https://blog.youkuaiyun.com/lslxdx/article/details/51680168

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var Q = require('q');

function _o(msg){console.log(msg);}

function main(){
  var obj1 = {
    var1: 1,
    func1: function(callback){_o('obj1.func1, var1 = ' + this.var1); callback(null, this.var1);}
  };

  var obj2 = {
    var2: 2,
    func2: function(callback){_o('obj2.func2, var2 = ' + this.var2); callback(null, this.var2);},
    func3: function(param, callback){_o('obj2.func3, param = ' + param); callback(param, null);}
  };

  Q.ninvoke(obj1, 'func1').
    then((rslt)=>{_o('success, rslt = ' + rslt); return Q.ninvoke(obj2, 'func2');          }, (err)=>{_o('fail, err = ' + err)}).
    then((rslt)=>{_o('success, rslt = ' + rslt); return Q.ninvoke(obj2, 'func3', 'param1');}, (err)=>{_o('fail, err = ' + err)}).
    then((rslt)=>{_o('success, rslt = ' + rslt);                                           }, (err)=>{_o('fail, err = ' + err)});
}

main();

//output: 
//obj1.func1, var1 = 1
//success, rslt = 1
//obj2.func2, var2 = 2
//success, rslt = 2
//obj2.func3, param = param1
//fail, err = param1