<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input type="text" class="zxw51" name="zxw" id="wyzxw" value="我要好好学习" abc="1123" />
<script type="text/javascript">
var z=document.getElementById("wyzxw")
document.write("<br>");
document.write("z.id的值是：",z.id,"<br>");
document.write("z.value的值是：",z.value,"<br>");
document.write("z.type的值是：",z.type,"<br>");
document.write("z.className的值是：",z.className,"<br>");
document.write("z.abc的值是：",z.abc,"<br>");
z.value="我要天天向上"
document.write("z.value修改后的值是：",z.value,"<br>");
</script>
</body>
</html>
返回值：