JavaScript异步asynchronous
This is called blocking.
In our simple-sync.html example (see it running live), we add a click event listener to a button so that when clicked, it runs a time-consuming operation (calculates 10 million dates then logs the final one to the console) and then adds a paragraph to the DOM:
In our simple-sync.html example (see it running live), we add a click event listener to a button so that when clicked, it runs a time-consuming operation (calculates 10 million dates then logs the final one to the console) and then adds a paragraph to the DOM:
const btn = document.querySelector('button');
btn.addEventListener('click', () => {
let myDate;
for(let i = 0; i < 10000000; i++) {
let date = new Date();
myDate = date;
}
console.log(myDate);
let pElem = document.createElement('p');
pElem.textContent = 'This is a newly-added paragraph.';
document.body.appendChild(pElem);
});
阅读量: 592
发布于:
修改于:
发布于:
修改于: