//调用函数
ajax({
url: 'your request url',
method: 'get',
async: true,
timeout: 1000,
data: {
test: 1,
aaa: 2
}
}).then(
res => console.log('请求成功: ' + res),
err => console.log('请求失败: ' + err)
)
//重点。。。函数封装
function ajax (options) {
let url = options.url
const method = options.method.toLocaleLowerCase() || 'get'
const async = options.async != false // default is true
const data = options.data
const xhr = new XMLHttpRequest()
if (options.timeout && options.timeout > 0) {
xhr.timeout = options.timeout
}
return new Promise ( (resolve, reject) => {
xhr.ontimeout = () => reject && reject('请求超时')
xhr.onreadystatechange = () => {
if (xhr.readyState == 4) {
if (xhr.status >= 200 && xhr.status < 300 || xhr.status == 304) {
resolve && resolve(xhr.responseText)
} else {
reject && reject()
}
}
}
xhr.onerror = err => reject && reject(err)
let paramArr = []
let encodeData
if (data instanceof Object) {
for (let key in data) {
// 参数拼接需要通过 encodeURIComponent 进行编码
paramArr.push( encodeURIComponent(key) + '=' + encodeURIComponent(data[key]) )
}
encodeData = paramArr.join('&')
}
if (method === 'get') {
// 检测 url 中是否已存在 ? 及其位置
const index = url.indexOf('?')
if (index === -1) url += '?'
else if (index !== url.length -1) url += '&'
// 拼接 url
url += encodeData
}
xhr.open(method, url, async)
if (method === 'get') xhr.send(null)
else {
// post 方式需要设置请求头
xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded;charset=UTF-8')
xhr.send(encodeData)
}
} )
}
javascript系列之使用Promise封装ajax
猜你喜欢
转载自blog.csdn.net/qq_34134278/article/details/78807886
今日推荐
周排行