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js export function参数后面的冒号为什么会报错?

看到Vue.js中大量这种写法,就学习模仿一下,我这样写为什么报错?
1png.png

//a.js
export function isStringStart (str: number) { 
    return str
} 
//b.js

import {isStringStart} from './a.js';

console.log(isStringStart(2));

运行后报错

2.png### 题目描述


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1 Answer

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by (71.8m points)

vue源码使用的typescript 语法,和es6是有很大不同的,而且编译工具用的的rollup;要针对ts语法使用对应的插件,比如webpack有ts-loader插件。


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