el-dialog 设置标头

在使用el-dialog组件时，可以通过在title属性里使用插槽的方式来设置多个不同样式的字符串。具体做法是在title属性的值前面加上`<template>`标签，并在内部使用`<span>`等标签来包裹需要设置不同样式的字符串。例如：

<el-dialog :title="`<template><span style='color: red;'>Hello</span> <span style='color: blue;'>World</span></template>`">
  <!-- 对话框内容 -->
</el-dialog>

这样就可以在el-dialog的标题中设置两个不同样式的字符串，分别为"Hello"和"World"，其中"Hello"的颜色为红色，"World"的颜色为蓝色。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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