所有“提前买单”字样，修改为“在线买单”

@@ -7,7 +7,7 @@ page{
     padding: 204rpx 0 60rpx;
     background-size: 100% auto;
     background-repeat: no-repeat;
-    background-image: url("http://nosqn.colorcun.com/checkout/images/3.png");
+    background-image: url("http://nosqn.colorcun.com/checkout/images/online-buy.png");
 }
 .content{
     width: calc(100% - 40rpx);