关于input的一些小知识

input::placeholder {
font-family: "Microsoft Yahei","微软雅黑",arial; font-size: 12px;
}
input::-moz-input-placeholder {
font-family: "Microsoft Yahei","微软雅黑",arial; font-size: 12px;
}
input::-webkit-input-placeholder {
font-family: "Microsoft Yahei","微软雅黑",arial; font-size: 12px;
}
input::-ms-input-placeholder {
font-family: "Microsoft Yahei","微软雅黑",arial; font-size: 12px;
}