fixbug json类型转换后被保留

@@ -295,11 +295,12 @@ Page({
 		if(!this.reserve.selectroom || (this.reserve.selectroom && this.reserve.selectroom.length==0)){
 			return util.toast('请选择包间类型','none');
 		}
-		this.reserve.sid=this.options.id
-		this.reserve.ddate=util.timetouUnix(this.reserve.date+' '+this.reserve.time+':00');
-		this.reserve.selectroom=JSON.stringify(this.reserve.selectroom);
+		let params={...this.reserve}
+    params.sid=this.options.id
+    params.ddate=util.timetouUnix(this.reserve.date+' '+this.reserve.time+':00');
+    params.selectroom=JSON.stringify(this.reserve.selectroom);
 		wx.navigateTo({
-		  url:util.http_build_query(this.reserve,'./submit')
+		  url:util.http_build_query(params,'./submit')
 		})
 	},
   selecttime(e){//时间改变