node 笔记整理

node 合并多个请求的数据

     function getList1(num) {

           var url= "netease/search?keyword=独孤天下&type=song&pageSize=10&page=0";

             return    ajaxGET(url)

   }

       function getList2(num) {

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

             setTimeout(() => {

                 resolve("haha第2个啊")

             }, 1100);

         } )

   }

function getList0(num) {

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

             setTimeout(() => {

                 resolve("haha第 0个啊")

             }, 10);

         } )

   }

      async function testResult() {

       try {

      let result0 = await getList0(); // 搜索 id

      let result1 = await getList1();//搜索歌词

       let result2 = await getList2(); // 搜索 id

        console.log(result0,result1,result2);

       } catch(err) {

                    console.log(err);

        }

    }

 testResult();

　　

　　

eventproxy 控制并发

var ep = new eventproxy();
ep.all('data1_event', 'data2_event', 'data3_event', function (data1, data2, data3) {
 var html = fuck(data1, data2, data3);
 render(html);
});
$.get('http://data1_source', function (data) {
 ep.emit('data1_event', data);
 });
$.get('http://data2_source', function (data) {
 ep.emit('data2_event', data);
 });
$.get('http://data3_source', function (data) {
 ep.emit('data3_event', data);
 });

async控制并发，可以控制并发数

ar async=require('async')

var test=function(item,callback){
    setTimeout(function(){
        console.log(item+'ok')
        callback(null,item+'result')
    },2000)
}

var items=[1,2,3,4,5,7,8,9,10]

async.mapLimit(items,2,function(item,callback){
    test(item,callback)
},function(err,result){
    console.log(result)
})