EL表达式选中select的option问题

错误的解决方案：

<label for="customer_level">客户等级:</label>
            <select name="customer_level" id="customer_level">
                <option value="1" selected="${order.customer_level!=1?false:true}">1级</option>
                <option value="2" selected="${order.customer_level!=2?false:true}">2级</option>
                <option value="3" selected="${order.customer_level!=3?false:true}">3级</option>
            </select>

第一种：解决方案
使用js方法一开始就加载绑定上去

 window.onload = function () {
//动态选择客户等级
        $("#customer_level option[value='']").removeAttr("selected"); //2.移除默认选项的选中状态  removeAttr("selected")
        $("#customer_level option[value='" + '${order.customer_level}' + "']").attr("selected", "selected");

        //一开始的时候加载客户名称数据，动态选择客户名字
        $("#customerId option[value='']").removeAttr("selected"); //2.移除默认选项的选中状态  removeAttr("selected")
        $("#customerId option[value='" + '${order.customerId}' + "']").attr("selected", "selected");

        //动态选择订单的状态
        $("#order_status option[value='']").removeAttr("selected"); //2.移除默认选项的选中状态  removeAttr("selected")
        $("#order_status option[value='" + '${order.order_status}' + "']").attr("selected", "selected");

        //动态选择用途
        $("#use option[value='']").removeAttr("selected"); //2.移除默认选项的选中状态  removeAttr("selected")
        $("#use option[value='" + '${order.use}' + "']").attr("selected", "selected");
        }

第二种解决方案：

 <label for="customer_level">客户等级:</label>
            <select name="customer_level" id="customer_level">
                <option value="1" ${order.customer_level!=1?"":"selected"}>1级</option>
                <option value="2" ${order.customer_level!=2?"":"selected"}>2级</option>
                <option value="3" ${order.customer_level!=3?"":"selected"}>3级</option>
            </select>

案例：

<select name="customerId" id="customerId">
                <c:forEach var="i" items="${customerName}">
                    <option value="${i.id}" ${order.customerId!=i.id?"":"selected"}>${i.name}</option>
                </c:forEach>
            </select>

推荐使用第二种解决方法