$(function() {
var $buttonsArray = [];
var $buttondiv = $('#btndiv');
for (var i = 0; i < 3; i++) {
var $button = "hello";
$buttonsArray.push($button);
}
for (var j = 0; j < $buttonsArray.length; j++) {
$buttondiv.append($buttonsArray[j]);
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="btndiv"></div>
默认情况下,在所有这些javascript类型上,如果仅将它们放入DOM元素中,浏览器就会尝试将它们转换为字符串。
const someNumber = 1
const someString = 'hello'
const someObject = {answer:42}
const someArray = [1, 'help', 3, {a:2}]
document.write(someNumber + '<br/ >')
document.write(someString + '<br/ >')
document.write(someObject + '<br/ >')
document.write(someArray + '<br/ >')
// is the same as
document.write(someNumber.toString() + '<br/ >')
document.write(someString.toString() + '<br/ >')
document.write(someObject.toString() + '<br/ >')
document.write(someArray.toString() + '<br/ >')
处理数组时,可以使用.join
重新组合它们例如
const greets = ['allo', 'hello', 'holla']; function render() { // This write the list separated with comas using join document.getElementById('app').innerHTML = greets.join(', '); // This works too but can be slow and doesn't not allow much flexibility document.getElementById('debug').innerHTML = JSON.stringify(greets); } render(); setTimeout(() => { greets.push('oi'); render(); }, 1000)
<div id="app"></div> <pre id="debug"></pre>