动态绑定placeholder即可
<input :placeholder='defaultInputData'>
//修改placeholder的样式
input::-webkit-input-placeholder {
color: #b4b4b4;
}
input:-moz-placeholder {
color: #b4b4b4;
}
input::-moz-placeholder {
color: #b4b4b4;
}
input:-ms-input-placeholder {
color: #b4b4b4;
}
