在JavaScript中,处理异步操作的常见方法有以下几种:
function asyncOperation(callback) {
setTimeout(() => {
const result = '异步操作结果';
callback(result);
}, 1000);
}
asyncOperation((result) => {
console.log('回调函数接收到结果:', result);
});
.then()
和.catch()
方法来处理成功或失败的结果。function asyncOperation() {
return new Promise((resolve, reject) => {
setTimeout(() => {
const result = '异步操作结果';
resolve(result); // 成功时调用resolve
// reject('出错了'); // 失败时调用reject
}, 1000);
});
}
asyncOperation()
.then((result) => {
console.log('Promise成功:', result);
})
.catch((error) => {
console.log('Promise失败:', error);
});
async function asyncOperation() {
return new Promise((resolve, reject) => {
setTimeout(() => {
const result = '异步操作结果';
resolve(result);
}, 1000);
});
}
async function main() {
try {
const result = await asyncOperation();
console.log('async/await成功:', result);
} catch (error) {
console.log('async/await失败:', error);
}
}
main();
load
事件。const xhr = new XMLHttpRequest();
xhr.open('GET', 'https://api.example.com/data');
xhr.onreadystatechange = function () {
if (xhr.readyState === 4 && xhr.status === 200) {
const result = JSON.parse(xhr.responseText);
console.log('事件监听成功:', result);
}
};
xhr.send();
这些方法可以根据具体需求和场景选择使用,以实现更好的异步处理效果。