样式中的display控制DOM的显示与隐藏 none:隐藏 block:(默认)显示
<script>
function fun(){
document.getElementById("txt").style.display="none";
}
function fun2(){
document.getElementById("txt").style.display="block";
}
</script>
<html>
<body>
<form>
<input type="text" id="txt" name="fname">
<br>
<input type="button" value="隐藏" onclick="fun()">
<input type="button" value="提交" onclick="fun2()">
</form>
</body>
</html>
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