打印费合计金额问题

src/main/resources/templates/staprintingfee/add.html

@@ -33,6 +33,7 @@
             <label class="layui-form-label " style="width: 70px">单页费用</label>
             <div class="layui-input-inline" style="width: 270px">
                 <select name="dcfy" id="dcfy" lay-filter="dcfy">
+                    <option value="null" selected disabled hidden>请选择单价</option>
                     <option value="0.12">0.12</option>
                     <option value="0.96">0.96</option>
                     <option value="7.68">7.68</option>
@@ -42,7 +43,7 @@
         <div class="layui-form-item layui-inline" style="width: 100%">
             <label class="layui-form-label required" style="width: 70px">合计</label>
             <div class="layui-input-inline" style="width: 270px">
-                <input type="number" id="hj" name="hj" autocomplete="off" class="layui-input" readonly placeholder="系统自动计算">
+                <input type="number" id="hj" name="hj" value="hj" autocomplete="off" class="layui-input" readonly >
             </div>
         </div>
 
@@ -85,10 +86,12 @@
 
         form.on('select(dcfy)',function (data){
             if(dcysValue!=undefined&&dycsValue!=undefined){
-                hjInput.value = dcysValue * dycsValue * data.value;
+                $("#hj").val(dcysValue * dycsValue * data.value);
+  /*              hjInput.value = dcysValue * dycsValue * data.value;*/
             }
         })
 
+
         //监听提交
         form.on('submit(saveBtn)', function (data) {