round cost when render in clinet

@@ -212,7 +212,7 @@
                 \{{/each}}
                 <li class="need-pay">
                     <span class="balance-title">应付金额\{{#if shipping_cost}}（含运费）\{{/if}}：</span>
-                    <span id="balance-cost" class="balance-cost" data-cost="{{last_order_amount}}">¥<em>\{{last_order_amount}}</em></span>
+                    <span id="balance-cost" class="balance-cost" data-cost="{{last_order_amount}}">¥<em>\{{round last_order_amount 2}}</em></span>
                 </li>
                 <li>
                     <span id="submit-order" class="btn submit-order">提交订单</span>

@@ -47,6 +47,13 @@ require('../plugins/check'); // before 地址和发票
 require('./order/address'); // 地址
 require('./order/invoice'); // 发票
 
+// clint helper round
+Hbs.registerHelper('round', function(num, precision) {
+    precision = precision ? parseInt(precision, 10) : 2;
+    num = (num === +num) ? (+num).toFixed(precision) : (Math.round(num, precision)).toFixed(precision);
+    return num;
+});
+
 lazyLoad($('img.lazy'));
 
 // dot