new Promise(function(resolve,reject){ setTimeout(function(){ var ret = "异步1执行成功!"; console.log(ret); resolve(ret); },2000); }) .then(function(msg){ return new Promise(function(resolve,reject){ setTimeout(function(){ var ret = "异步2执行成功!"; console.log(ret); ret +="->"+msg; resolve(ret); },2000); }) }) .then(function(msg){ return new Promise(function(resolve,reject){ setTimeout(function(){ var ret = "异步3执行成功!"; console.log(ret); ret +="->"+msg; resolve(ret); },2000); }) }) .then(function(msg){ console.log(msg); })
JS Promise使用示例
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转载自www.cnblogs.com/kerryw/p/9337988.html
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