<input name="email" type="email" class="form-control" placeholder="zhangsan@atguigu.com" th:value="${emp!=null}?${emp.email}">
<input name="email" type="email" class="form-control" placeholder="zhangsan@atguigu.com" th:value="${emp!=null}?'hello':'nihao'">
<input name="email" type="email" class="form-control" placeholder="zhangsan@atguigu.com" th:value="${emp!=null?'hello':'nihao'}">
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