回答編集履歴
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sample
test
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単純に言えば（主に並行稼動する）非同期処理を待つ処理
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# sample
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sampleつけときます
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8
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(IE対応のためpromisejsを読み込んでください、IE無視してよいなら不要です)
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```javascript
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<script src="https://www.promisejs.org/polyfills/promise-6.1.0.min.js"></script>
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<script>
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var a=0;
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var prm=[];
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function test(){
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prm[0]= new Promise(function(resolver){
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setTimeout(function(){a+=1;console.log(a);resolver(this);},1000);
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});
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prm[1]= new Promise(function(resolver){
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setTimeout(function(){a+=10;console.log(a);resolver(this);},2000);
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});
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prm[2]= new Promise(function(resolver){
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setTimeout(function(){a+=100;console.log(a);resolver(this);},3000);
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});
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Promise.all( prm ).then(function(){
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console.log("end");
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});
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};
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test();
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</script>
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55
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```
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