在Vue1.0里面的过滤代码。添加到Vue2.0用，过滤货币，大小写，筛选！

直接上代码

  var filters = {

    orderBy: orderBy,
    filterBy: filterBy,
    limitBy: limitBy,

    /**
     * Stringify value.
     *
     * @param {Number} indent
     */

    json: {
      read: function read(value, indent) {
        return typeof value === 'string' ? value : JSON.stringify(value, null, Number(indent) || 2);
      },
      write: function write(value) {
        try {
          return JSON.parse(value);
        } catch (e) {
          return value;
        }
      }
    },

    /**
     * 'abc' => 'Abc'
     */

    capitalize: function capitalize(value) {
      if (!value && value !== 0) return '';
      value = value.toString();
      return value.charAt(0).toUpperCase() + value.slice(1);
    },

    /**
     * 'abc' => 'ABC'
     */

    uppercase: function uppercase(value) {
      return value || value === 0 ? value.toString().toUpperCase() : '';
    },

    /**
     * 'AbC' => 'abc'
     */

    lowercase: function lowercase(value) {
      return value || value === 0 ? value.toString().toLowerCase() : '';
    },

    /**
     * 12345 => $12,345.00
     *
     * @param {String} sign
     */

    currency: function currency(value, _currency) {
      value = parseFloat(value);
      if (!isFinite(value) || !value && value !== 0) return '';
      _currency = _currency != null ? _currency : '$';
      var stringified = Math.abs(value).toFixed(2);
      var _int = stringified.slice(0, -3);
      var i = _int.length % 3;
      var head = i > 0 ? _int.slice(0, i) + (_int.length > 3 ? ',' : '') : '';
      var _float = stringified.slice(-3);
      var sign = value < 0 ? '-' : '';
      return sign + _currency + head + _int.slice(i).replace(digitsRE, '$1,') + _float;
    },

    /**
     * 'item' => 'items'
     *
     * @params
     *  an array of strings corresponding to
     *  the single, double, triple ... forms of the word to
     *  be pluralized. When the number to be pluralized
     *  exceeds the length of the args, it will use the last
     *  entry in the array.
     *
     *  e.g. ['single', 'double', 'triple', 'multiple']
     */

    pluralize: function pluralize(value) {
      var args = toArray(arguments, 1);
      return args.length > 1 ? args[value % 10 - 1] || args[args.length - 1] : args[0] + (value === 1 ? '' : 's');
    },

    /**
     * Debounce a handler function.
     *
     * @param {Function} handler
     * @param {Number} delay = 300
     * @return {Function}
     */

    debounce: function debounce(handler, delay) {
      if (!handler) return;
      if (!delay) {
        delay = 300;
      }
      return _debounce(handler, delay);
    }
  };