vant-weapp/packages/rate/index.ts

import { VantComponent } from '../common/component';

VantComponent({
  field: true,

  props: {
    readonly: Boolean,
    disabled: Boolean,
    size: {
      type: Number,
      value: 20
    },
    color: {
      type: String,
      value: '#ffd21e'
    },
    voidColor: {
      type: String,
      value: '#c7c7c7'
    },
    disabledColor: {
      type: String,
      value: '#bdbdbd'
    },
    count: {
      type: Number,
      value: 5
    },
    value: {
      type: Number,
      value: 0
    }
  },

  data: {
    innerValue: 0
  },

  watch: {
    value(value) {
      if (value !== this.data.innerValue) {
        this.setData({ innerValue: value });
      }
    }
  },

  computed: {
    list() {
      const { count, innerValue } = this.data;
      return Array.from({ length: count }, (_, index) => index < innerValue);
    }
  },

  methods: {
    onSelect(event: Weapp.Event) {
      const { data } = this;
      const { index } = event.currentTarget.dataset;
      if (!data.disabled && !data.readonly) {
        this.setData({ innerValue: index + 1 });
        this.$emit('input', index + 1);
        this.$emit('change', index + 1);
      }
    },

    onTouchMove(event: Weapp.TouchEvent) {
      const { clientX, clientY } = event.touches[0];

      this.getRect('.van-rate__item', true).then(list => {
        const target = list.find(
          item =>
            clientX >= item.left &&
            clientX <= item.right &&
            clientY >= item.top &&
            clientY <= item.bottom
        );
        if (target != null) {
          this.onSelect({
            ...event,
            currentTarget: target
          });
        }
      });
    }
  }
});