uniapp textarea placeholder样式

在uniapp中，可以使用以下两种方式设置textarea的placeholder样式：

第一种方式是在行内直接设置样式，如：
<textarea id="textArea" name="" placeholder="请输入" style="color: white; height: 50px;"></textarea> [1]

第二种方式是通过设置placeholder-class属性，并在样式表中定义样式类，如：
<textarea id="textArea" name="" placeholder="请输入" placeholder-class="custom-placeholder"></textarea>
<style>
.custom-placeholder {
color: red;
}
</style> [2]

以上两种方式都可以实现textarea的placeholder样式定制化。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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