res.set_attr 空字符串错误

[Liber-coder]

JavaScript：

<form action="/submit" method="POST">
					<div class="input-field col s6">
						<input id="value1" name="value1" value=${value1} type="text" class="validate">
        			    <label for="value1">value1</label>
					</div>
</form> 

c++:

res.set_attr("value1","");

界面value显示错误：显示结果：

<input id="camera_number" name="camera_number" value="type=&quot;text&quot;" class="validate">