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调用walk时第二个实参cb的参数是不是漏了?

ast.js中walk调用cb会传入一个参数
exports.walk = function (node, cb) {
if (node instanceof Array) {
node.forEach(function (child) {
cb(child);
});
} else if (typeof node === 'object' && node !== null) {
cb(node);
}
};
replaceOuter.js中_walk调用walk时的cb是不带参数的
function _walk(node, isExpression) {
walk(node, function () {
// replace this
if (node.type === 'ThisExpression') {
...
}
函数体中的node拿到的是_walk的第一个参数,是个数组

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