[javascript]<script>
// Edit your script here
$(document).ready(function(){
$("p").click(function(){
$(this).hide();
});
});
</script>
</head>
<body>
<p>If you click on me, I will disappear.</p>
<p>Click me away!</p>
<p>Click me too!</p>
[/javascript]
找input 的 id=”test”
https://js.do/powenko/01-find-input-id
[javascript]
<script src="//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<input id="test1" list="values" placeholder="select">
<datalist id="values">
<option value="orange">
<option value="banana">
<option value="lemon">
<option value="apple">
</datalist>
<script>
$(‘input #test1’).on(‘click’, function() {
$(this).attr(‘placeholder’,$(this).val());
$(this).val(”);
});
$(‘input #test1’).on(‘mouseleave’, function() {
if ($(this).val() == ”) {
$(this).val($(this).attr(‘placeholder’));
}
});
</script>
<!– edit your html here –>
[/javascript]