JS正则如何限制打折小数点？

let regDis = /^(?=0\.[1-9]|[1-9]\.\d).{3}$|^([2-9])$/

let regDis = /^[0-9]{1}(\.[0-9])?$/

<script type="text/javascript" src="https://res.wx.qq.com/open/js/jweixin-1.3.2.js"></script>
<script>
    var ua = navigator.userAgent.toLowerCase();
    if(ua.match(/MicroMessenger/i)=="micromessenger") {
        //ios的ua中无miniProgram，但都有MicroMessenger（表示是微信浏览器）
        wx.miniProgram.getEnv((res)=>{
           if (res.miniprogram) {
               alert("在小程序里");
           } else {
               alert("不在小程序里");
           }
        })
    }else{
        alert('不在微信里');
    }
</script>

export default {
  data() {
    return {
      jumpUrl: '',
      newWin: null  // 新窗口的引用
    }
  },
  watch: {
    url(newVal, oldVal) {
      if(newVal && this.newWin) {
        this.newWin.sessionStorage.clear()
        this.newWin.location.href = newVal;
        this.jumpUrl = '';
        this.newWin = null;
      }
    }
  },
  methods: {
    clickHandle() {
      let _this = this;
      // 先打开一个空的新窗口，再请求
      this.newWin = window.open();
      api.get('xxx', params).then(response => {
        let data = response.data;
        if(data.code === 0 ) {
          _this.jumpUrl = data.data.url || '';
        }
      });
    }
  }
}

export function deteleObject(obj) {
    var uniques = [];
    var stringify = {};
    for (var i = 0; i < obj.length; i++) {
        var keys = Object.keys(obj[i]);
        keys.sort(function(a, b) {
            return (Number(a) - Number(b));
        });
        var str = '';
        for (var j = 0; j < keys.length; j++) {
            str += JSON.stringify(keys[j]);
            str += JSON.stringify(obj[i][keys[j]]);
        }
        if (!stringify.hasOwnProperty(str)) {
            uniques.push(obj[i]);
            stringify[str] = true;
        }
    }
    uniques = uniques;
    return uniques;
}

  deteleObject(obj) {
    var hash = {};
    obj = obj.reduce(function(item, next) {
        hash[next.openid] ? '' : hash[next.openid] = true && item.push(next);
        return item
    }, [])
    return obj
  },