input { width:320px; height:40px; outline:none; border:1px solid #DDDDDD; padding-left:12px; display:block; margin:20px auto 0 auto; } .box { width:500px; height:500px; margin:100px auto; } .btn { width:260px; height:40px; border-radius:5px; } .orange { background-color:orange!important; color:#fff!important; }
实时检测表单是否填写完毕,按钮禁用