高级参数设置中转base64不成功

[JSMengLingqi]

点击接口列表->运行->高级参数设置->
输入以下常量：
{"app_id" :"2019110000000123","subject" :"test","order_type" :"OTHERS","version" :"2.1.2","total_amount" :"3360","charge_account" :"15600000002","goods_list" : [ {"goods_detail" : {"productDetail" :"test","product" :"hgds","saleAmount" :"33.60","thumbnail" :"detail-dazs.png" },"number" : 1,"goods_id" :"1244606","goods_desc" :"one" } ],"open_id" :"bxidfsjeozs9qnlqe6yerh0yd82j0xw2","start_time" :"2019-09-19 02:32:55","path" :"newOrder","isThird" : 1,"mch_id" :"20191003"}
在方法中点击更多->选择base64
预览可以看到转换不成功

[BetaGo]

@JSMengLingqi
原版yapi的常量输入，其实是作为一个表达式来处理的，假如输入 a | base64 会对 a 执行base64加密。 其中 {}|,:这些符号都有特殊含义，所以导致了转化失效。
现新加了一个安全常量的输入，会对输入值做一层转义，来实现参数转换，