js+获取ajax状态码

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
    if (xhr.readyState == 4) { // 4 means request is complete
        console.log('Status Code:', xhr.status);
        // Handle different status codes
        if (xhr.status >= 200 && xhr.status < 300) {
            // Success
        } else if (xhr.status >= 400) {
            // Client error
        } else if (xhr.status >= 500) {
            // Server error
        }
    }
};
xhr.open('GET', 'your-url', true);
xhr.send();

fetch('your-url')
    .then(response => {
        console.log('Status Code:', response.status);
        // Handle different status codes
        if (response.ok) { // status codes in the range 200-299
            return response.json();
        } else {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
    })
    .then(data => {
        // Process the data
    })
    .catch(error => {
        console.error('Fetch Error:', error);
    });