vue指令只能输入正数并且只能输入一个小数点的方法

Vue.directive('numbers', { bind: function (el, binding) {  console.log('ere') }, inserted: function (el) {  // el.querySelector('input').blur(console.log('etset')) }, update: function (el, binding, vnode, oldVnode) {  console.log('vnode', vnode)  let express = vnode.data.directives[1].expression  // let value = el.querySelector('input').value  let value = vnode.data.directives[1].value  if (typeof value === 'string') {} //在重置的时候清空  if (value.split('.').length - 1 > 1) {   value = value.replace(//.{2,}/g, '') // 只保留第一个. 清除多余的   value = value.replace('.', '$#$').replace(//./g, '').replace('$#$', '.')  }  let repeatValue = value.replace(/[^/d.]/g, '')  // setTimeout(() => {  //  el.querySelector('input').value = repeatValue  // }, 5)  setValueWithExpressionVue(vnode.context.$data, express, repeatValue) }, componentUpdated: function () {}, unbind: function (el) {}})// function setValueWithExpressionVue (currObj, expression, value) { expression = expression.split('.') expression.forEach(function (arg, i) {  if (i < expression.length - 1) {   currObj = currObj[arg]  } else {   currObj[arg] = value  } })}