遇到头疼的vue计算属性传参问题
经过各种资料查找，亲测有效

1. index.vue

<van-circle
      v-model="Ratedata[index].currentRate"
         color="#2462E8"
         fill="#fff"
         layer-color="#E6E6E6"
         :rate="Ratedata[index].rate"
         :text="text(index)"
         :speed="60"
         :clockwise="true"
         :stroke-width="40"
 />

2. computed中text方法传递index，利用了闭包传值

computed: {
          text() {
              return function (index) {
                  return this.Ratedata[index].currentRate.toFixed(0) + '%';
              }
          }
        },