只初始化一次
最后更新于：2022-04-02 03:24:06
[TOC]
## 仅仅初始化一次
bad
```
function whichSideOfTheForce1(name) {
const light = ['Luke', 'Obi-Wan', 'Yoda'];
const dark = ['Vader', 'Palpatine'];
return light.includes(name) ? 'light' : dark.includes(name) ? 'dark' : 'unknown';
}
whichSideOfTheForce1('Luke');
whichSideOfTheForce1('Vader');
```
good
```
function whichSideOfTheForceClosure1(name) {
const light = ['Luke', 'Obi-Wan', 'Yoda'];
const dark = ['Vader', 'Palpatine'];
console.log("run");
return (name) => (light.includes(name) ? 'light' : dark.includes(name) ? 'dark' : 'unknown');
}
const whichSideOfTheForce2 = whichSideOfTheForceClosure1();
whichSideOfTheForce2('Luke');
whichSideOfTheForce2('Vader');
```
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