console 命令行工具 X clear

console

let arr = [1,2,[2,3],4];
function myFlatten(arr=[]) {
    return arr.toLocaleString().split(',');
}
let doc = document.getElementById('text1');
doc.innerText = myFlatten(arr);
doc.innerHTML = '<a>哈哈哈</a>'

let input = document.getElementById('input1');

input.value = '我是Input的值'

<div>
    <p id="text1">aaa</p>
    <form action="">
        <input id='input1'>
        <button type="sumit">提交</button>
    </form>
</div>