vue如何判断余额支付逻辑

payNow() {
				this.showLoading = true
				prepay({
					from: 'order',
					order_id: Number(this.id)
				}).then(res => {
					if (res.code == 1) {
						this.showLoading = false
						let args = res.data; //data: "余额测试" args取到的就是"余额测试"  wxpay这个里面的参数就是"余额测试"  你那边怎么取的到呢
						wxpay(args).then(() => {
							this.$toast({
								title: "支付成功"
							})
							this.getOrderDetailFun();
							uni.$emit("refreshorder")
						}).catch(() => {
							this.showLoading = false
						});
					}
				});
			},

<view class="pay-way contain">
					<view class="lighter title">支付方式</view>
					<radio-group class="radio-group" @change="radioChange">
						<label v-for="(item, index) in payWayArr" :key="index" class="item row-between">
							<view class="row">
								<image class="icon-lg mr20" :src="item.icon"></image>
								<view class>
									<view class="balck bt10">{{item.name}}</view>
									<view class="muted xs">{{item.desc}}{{ item.type == 3 ? orderInfo.user_money : ''}}</view>
								</view>
							</view>
							<radio class="radio" :value="String(item.type)" :checked="item.type == payWay"></radio>
						</label>
					</radio-group>
				</view>

没太看懂