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- function ajax(url) {
- return new Promise((resolve, reject) => {
- const xhr = new XMLHttpRequest()
- xhr.open('GET', url, true)
- xhr.onreadystatechange = function () {
- if(xhr.readyState === 4) {
- if(xhr.status === 200) {
- resolve(JSON.parse(xhr.responseText))
- }else if(xhr.status === 404){
- reject(new Error('404 not found'))
- }
- }
- }
- xhr.send()
- })
- }
- const url = '/data/test.json'
- ajax(url)
- .then(res=>console.log(res))
- .catch(err=>console.log(err))
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