console 命令行工具 X clear
console
<div>
    <input type="" id="input">
</div>
<script>
    console.log(1)
    input.focus()
    setTimeout(()=>{
        console.log(2);
        input.focus()
    },300)
    window.addEventListener('load',()=>{
        console.log(3);
        input.focus()
    })
    window.addEventListener('visibilitychange',()=>{
        console.log(4);
        input.focus()
    })
    document.addEventListener('visibilitychange',()=>{
        console.log(5);
        input.focus()
    })
    
</script>