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並前往https://github-wiki-see.page/m/18174013022/Note/wiki/JS--focus%E4%BA%8B%E4%BB%B6%EF%BC%8Cdocument.getElementById(%22%22);

JS focus事件，document.getElementById(""); - GitHub Wiki SEE

1.元素指的是：input body div li p 2.var ID = document.ElementgetById(" ").value; if（ID == ""）{ alert("请输入id"); document.ElementgetById(" ").focus（）; ...

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