Es6 Promise 理解

弄懂下面的代码,待续

 var num = 0;
 function add(m){ console.log(m,num++); }

 new Promise(function(){}).then(add).then(add);

 new Promise(function(resolve,reject){
 resolve('oh-no-----');
 }).then(null,add).then(add).then(add).catch(add);

 Promise.resolve("Success").then(add).then(null).then(add).then(add).catch(add);