摘要：
<form action="" id="myform"> <progress value="20" max="100"> </form> <form action=""> <meter value="5" max="100" min="0" high="80" low="10" optimum="3 阅读全文
摘要：
<form action="" id="myform" oninput="num.value=parseInt(num1.value)+parseInt(num2.value)"> <input type="number" id="num1">+ <input type="number" id="n 阅读全文