如何在点击输入框时，让placeholder中的值去掉

Question

 <input type="text" placeholder="搜索：文档名称" class="insert-check" id="insert-check" onFocus="getFocus(this);" onBlur="getBlur(this);" value="<%=se_text %>" onkeypress="button_search_onkeypress()" />

请问我在输入框获得焦点时，怎么样才能去掉placeholder里面的值

Answer 1

 <input type="text" placeholder="搜索：文档名称" class="insert-check" id="insert-check" onfocus="this.setAttribute('placeholder', ''); getFocus(this);" onblur="if (this.value == '') this.setAttribute('placeholder', '搜索：文档名称');getBlur(this);" value="<%=se_text %>" onkeypress="button_search_onkeypress()" />