# [For of](https://babeljs.cn/docs/plugins/transform-es2015-for-of)
在 ES6 中可以使用 for-of 遍歷數組，可以使用 `babel-plugin-transform-es2015-for-of` 進行語法轉換。
```
npm install --save-dev babel-plugin-transform-es2015-for-of
```
## .babelrc 配置
```json
{
"plugins": ["transform-es2015-for-of"]
}
```
## 使用
in
```js
let arr = ['a', 'b', 'c']
for (var i of arr) {
console.log(i)
}
```
out
```js
'use strict';
var arr = ['a', 'b', 'c'];
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = arr[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
var i = _step.value;
console.log(i);
}
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
```
