# @babel/遍历
# 安装
- npm
npm install --save @babel/traverse
- yarn
yarn add @babel/traverse
# 用法
我们可以将它与 babel 解析器一起使用来遍历和更新节点:
JavaScript
import * as parser from "@babel/parser";
import traverse from "@babel/traverse";
const code = `function square(n) {
return n * n;
}`;
const ast = parser.parse(code);
traverse(ast, {
enter(path) {
if (path.isIdentifier({ name: "n" })) {
path.node.name = "x";
}
},
});
此外,我们可以针对语法树中的特定节点类型 (opens new window)
JavaScript
traverse(ast, {
FunctionDeclaration: function(path) {
path.node.id.name = "x";
},
});
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