2018.3.21前端常見面試題

1.javascript (function(){ var a=b=1; console.log(a); })() console.log(a,b); VM187:3 1 VM187:5 Uncaught ReferenceError: a is not defined at <anonymous>:5:13 註釋：console.log(a);輸出1， a局部做用域，b沒有聲明（爲全局做

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