有bug 完善進度條

<!--有bug   沒有整體讓進度變小,出現偏差 -->
<template>
	<view class="content">

		<view class="circleprogress">
			<view class="progresstext">{{progresstext}}</view>
			<view class="wrapper left">
				<view class="leftprogress" :style="{ transform: leftprogress}"></view>
			</view>
			<view class="wrapper right">
				<view class="rightprogress" :style="{ transform: rightprogress}"></view>
			</view>
		</view>

	</view>
</template>

<script>
	export default {
		data() {
			return {
				leftprogress: 'rotate(-45deg)',
				rightprogress: 'rotate(45deg)',
				progresstext: '60'
			}
		},
		onLoad() {
			// setTimeout在60秒後執行clearInterval清除定時器的操作
			this.showText = false
			var interval = setInterval(() => {
				--this.progresstext

				var that = this
				var val = that.progresstext;
				console.log("當前時間", val);
				var deg = val / 60 * 360; //時間和度數的對比
				if (deg <= 180) {
					this.rightprogress = 'rotate(' + eval(45 + deg) + 'deg)'
					this.leftprogress = 'rotate(' + eval(-45) + 'deg)'
				} else {
					this.rightprogress = 'rotate(' + eval(45 + 180) + 'deg)'
					this.leftprogress = 'rotate(' + eval(-45 + (deg - 180)) + 'deg)'
				}
			}, 1000)
			setTimeout(() => {
				clearInterval(interval)
				this.showText = true

				uni.showLoading({
					title: '閱讀完成!+5趣幣',

				})
			}, 60000)
		},
		methods: {

		}
	}
</script>

<style>
	.content {
		width: 100%;
		height: 100%;
		display: flex;
		justify-content: center;
		flex-flow: wrap;
		align-items: center;
		border-radius: 50%;
		text-align: center;
		height: 400upx;
		padding-top: 50px;
	}

	.circleprogress {
		width: 100%;
		height: 200px;
		display: flex;
		justify-content: center;

	}

	.progresstext {
		position: absolute;
		font-size: 40px;
		width: 200px;
		height: 200px;
		display: flex;
		justify-content: center;
		align-items: center;
		z-index: 10;
		color: #000000;
	}

	.wrapper {
		width: 100px;
		height: 200px;
		overflow: hidden;
	}


	.leftprogress,
	.rightprogress {
		width: 160px;
		height: 160px;
		border: 20px solid #FC8511;
		border-bottom: 20px solid #FFFFFF;
		border-radius: 50%;

	}

	.leftprogress {
		border-right: 20px solid #FFFFFF;
	}

	.rightprogress {
		border-left: 20px solid #FFFFFF;
		margin-left: -100px;
	}

	.section {
		width: 80%;
		margin-top: 50px;
	}
</style>

不知道你們有沒有聽懂      額    (我得語文...需要重修了)

功能:

    想要實現的效果就是使用上述的代碼實現一個60upx的大小的進度條

如圖

望大神指點迷津    = - =         = - =