uni.showToast 文本换行

uni.showToast文本换行可以使用\n来实现。例如：

uni.showToast({
title: '这是第一行\n这是第二行',
icon: 'none',
duration: 2000
})

其中\n表示换行，将文本分为多行显示。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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