js post 请求api

var xhr = new XMLHttpRequest();
xhr.open("POST", 'https://example.com/api', true);
xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");

xhr.onreadystatechange = function () {
    if (xhr.readyState === 4 && xhr.status === 200) {
        var response = JSON.parse(xhr.responseText);
        console.log(response);
    }
};

var data = JSON.stringify({
    username: "exampleUser",
    password: "examplePassword"
});

xhr.send(data);

fetch('https://example.com/api', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        username: "exampleUser",
        password: "examplePassword"
    })
})
.then(response => response.json())
.then(data => console.log(data))
.catch((error) => {
    console.error('Error:', error);
});