2
3
1
3
function sleep(milliseconds) {
return new Promise(resolve => setTimeout(resolve, milliseconds));
}
async function fun() {
document.write('Hello World');
for (let i = 1; i <=10 ; i++) {
await sleep(2000);
document.write( i + " " + "Welcome to the javaTpoint.com" + " " + "</br>");
}
}
fun();
8
function downloadCSV(csv, filename) {
var csvFile;
var downloadLink;
//define the file type to text/csv
csvFile = new Blob([csv], {type: 'text/csv'});
downloadLink = document.createElement("a");
downloadLink.download = filename;
downloadLink.href = window.URL.createObjectURL(csvFile);
downloadLink.style.display = "none";
document.body.appendChild(downloadLink);
downloadLink.click();
}
3
var hiddenElement = document.createElement('a');
hiddenElement.href = 'data:text/csv;charset=utf-8,' + encodeURI(csv);
hiddenElement.target = '_blank';
//provide the name for the CSV file to be downloaded
hiddenElement.download = 'Famous Personalities.csv';
hiddenElement.click();
34
const heart_box = document.getElementById('heart')
// 创建标签
let element = document.createElement('div')
element.id = `heart_${keyName}`
element.style.cssText = styles.container
heart_box.appendChild(element)
// 移除标签
setTimeout(function(){
const heart_element = document.getElementById(`heart_${keyName}`)
heart_box.removeChild(heart_element)
const heart_style = document.getElementById(`heart_id_${keyName}`)
document.head.removeChild(heart_style)
}, 3000)
80
function animate(options) {
var start = performance.now();
requestAnimationFrame(function animate(time) {
// timeFraction от 0 до 1
var timeFraction = (time - start) / options.duration;
if (timeFraction > 1) timeFraction = 1;
// текущее состояние анимации
var progress = options.timing(timeFraction)
options.draw(progress);
if (timeFraction < 1) {
requestAnimationFrame(animate);
}
});
}
108
readAsArrayBuffer(blob)
– 以二进制格式读取数据ArrayBuffer。readAsText(blob, [encoding])
– 以给定编码的文本字符串形式读取数据(utf-8默认情况下)。readAsDataURL(blob)
– 读取二进制数据并将其编码为 base64 数据 url。abort()
– 取消操作。- 更多方法:https://javascript.info/file
39
<form id="formElem">
<input type="text" name="name" value="John">
<input type="text" name="surname" value="Smith">
<input type="submit">
</form>
<script>
formElem.onsubmit = async (e) => {
e.preventDefault();
let response = await fetch('/article/formdata/post/user', {
method: 'POST',
body: new FormData(formElem)
});
let result = await response.json();
alert(result.message);
};
</script>