手写 AJAX

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1.手写 AJAX2024-06-06

2.手写 发布订阅2024-06-063.手写深拷贝2024-06-064.JS 易忽略问题2024-12-04

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• 手写ajax

// AJAX
const xhr = new XMLHttpRequest()
xhr.open('GET', '/xxx')
xhr.onreadystatechange = () => {
  if (xhr.readyState === 4) {
    const status = xhr.status
    if (status >= 200 && status < 300 || status === 304) {
      success(xhr)
    } else {
      fail(xhr)
    }
  }
}
xhr.send()