提供者 'xx' 必须从 AngularJs 中的 $get 工厂方法返回一个值 [英] Provider 'xx' must return a value from $get factory method in AngularJs

问题描述

我写了一个 angularjs 工厂如下

I have written an angularjs factory as below

module.factory('LogService', function () {

    function log(msg) {
        console.log("Rahkaran:" + new Date() + "::" + msg);
    }

    return 
    {
        log: log
    };

});

但是我一直收到这个错误

But I kept getting this error

Provider 'LogService' 必须从 $get 工厂方法返回一个值

我在谷歌上搜索了错误，但找不到任何解决方案.

I googled about the error and I couldn't find any solution.

巧合的是我把return语句改成了这个

Coincidentally I changed the return statement to this

return{
    log: log
};

错误消失了！！

在 return 前面和在下一行有 { 有什么区别吗?

Is there any differences between having { in front of return or at the next line?

推荐答案

这叫做自动分号插入

return 语句受自动分号插入 (ASI) 影响.返回关键字和允许的表达式之间没有行终止符 ;.

The return statement is affected by automatic semicolon insertion (ASI). There is no line terminator ; between the return keyword and the expression allowed.

return
a + b;

// is transformed by ASI into

return; 
a + b;

所以你必须在 return 前面插入 { 而不要在下一行.

So you must insert { in front of return and Not at the next line.

参考:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return

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