placeholder居中问题
.className::-ms-input-placeholder{text-align: center;} .className::-webkit-input-placeholder{text-align: center;} .className::-moz-placeholder{text-align: center;}
.className::-ms-input-placeholder{text-align: center;} .className::-webkit-input-placeholder{text-align: center;} .className::-moz-placeholder{text-align: center;}