创建filters.js 文件

/**
 * 10000 => "10,000"
 * @param {number} num
 */
export function toThousandFilter(num) {
  return (+num || 0).toString().replace(/^-?\d+/g, m => m.replace(/(?=(?!\b)(\d{3})+$)/g, ','))
}

/**
 * Upper case first char
 * @param {String} string
 */
export function uppercaseFirst(string) {
  return string.charAt(0).toUpperCase() + string.slice(1)
}

在mian.js 注册过滤器

import * as filters from './filters' // global filters
// register global utility filters
Object.keys(filters).forEach(key => {
  Vue.filter(key, filters[key])
})

可在代码中直接使用

<span>{{value|uppercaseFirst}}<span>