<input type="number" v-number-only >

directives: {
        // 限制input 只允许输入正整数
        'number-only': {
          bind(el) {
            el.addEventListener('input', function() {
              let val = this.value.replace(/[^\d]/g, '');
              if (val === '') {
                this.value = '';
              } else {
                val = val.replace(/^0+/, '') || '0';
                this.value = val;
              }
                // 异步派发事件
                setTimeout(() => {
                  const event = new Event('input', { bubbles: true });
                  this.dispatchEvent(event);
                }, 0);
            });
          }
        }
      }