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目的就像你说的，恢复该处的值为undefined，值和视图层同步，不需要的话将placeholder设为false就行。 |
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此处默认为true是有什么考量吗，我用下来的感觉是可以少写一些样板代码恢复该处的值为undefined,不过从vant/antd-mobile过来的用户会感到困惑，怎么多出来了一个请选择的item。
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