javascript - 语法错误 : Illegal return statement - searching for string in url

Question

我现在只是在 Chrome 的控制台中。我创建了这个变量:

url = window.location.href

给出:

网址"http://www.example.com/trips/dest/australia-and-south-pacific/cntry/fiji/ "

现在我尝试了这个:

if (url.indexOf('australia-and-south-pacific') > 0) {return 'foo';}

返回的是:

SyntaxError: Illegal return statement

我希望控制台返回“foo”。

为什么会这样？我注意到在收到此错误后，稍等片刻就会出现一个新错误:

Uncaught TypeError: Cannot read property 'hide' of undefined 

是否有助于诊断？

Answer 1

根据EMCAScript language specification ,

An ECMAScript program is considered syntactically incorrect if it contains a return statement that is not within a FunctionBody.