如何清除input中的内容

<div class="add_address_person rel fix">

            <input name="" type="text" class="person_address_input" id="linkMan"  placeholder="联系人不能超过10个字" value="${address.linkMan}" maxlength="10" />

            <em class="my_address_person">联系人：</em>

            <div class="clear-add"></div>

          </div>

           <div class="add_address_person rel fix">

            <input name="" type="number" class="person_address_input" id="linkPhone"  placeholder="请输入您的联系电话" value="${address.linkPhone}" />

            <em class="my_address_person">联系电话：</em>

            <div class="clear-add"></div>

          </div>

  });  

		// 清除input中的val值

			$(".person_address_input").focus(function() {

			  $(this).siblings(".clear-add").show();

			  $(".clear-add").click(function() {

			    var clear_num = $(this).siblings(".person_address_input").val();

			    clear_num = 0;

			    var clear_num1 = $(this).siblings(".person_address_input").val("");

			    $(".clear-add").hide();

			  });

			});

			 $(".person_address_input").blur(function() {

				$(this).siblings(".clear-add").hide();

			})