wxml
<input class="name" type="text" placeholder="姓名" placeholder-class="phClass"/>
wxss
.phClass{
font-size: 16rpx;
color:red;
}
wxml
<input class="name" type="text" placeholder="姓名" placeholder-class="phClass"/>
wxss
.phClass{
font-size: 16rpx;
color:red;
}