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
  1   var filters = {
  2 
  3     orderBy: orderBy,
  4     filterBy: filterBy,
  5     limitBy: limitBy,
  6 
  7     /**
  8      * Stringify value.
  9      *
 10      * @param {Number} indent
 11      */
 12 
 13     json: {
 14       read: function read(value, indent) {
 15         return typeof value === 'string' ? value : JSON.stringify(value, null, Number(indent) || 2);
 16       },
 17       write: function write(value) {
 18         try {
 19           return JSON.parse(value);
 20         } catch (e) {
 21           return value;
 22         }
 23       }
 24     },
 25 
 26     /**
 27      * 'abc' => 'Abc'
 28      */
 29 
 30     capitalize: function capitalize(value) {
 31       if (!value && value !== 0) return '';
 32       value = value.toString();
 33       return value.charAt(0).toUpperCase() + value.slice(1);
 34     },
 35 
 36     /**
 37      * 'abc' => 'ABC'
 38      */
 39 
 40     uppercase: function uppercase(value) {
 41       return value || value === 0 ? value.toString().toUpperCase() : '';
 42     },
 43 
 44     /**
 45      * 'AbC' => 'abc'
 46      */
 47 
 48     lowercase: function lowercase(value) {
 49       return value || value === 0 ? value.toString().toLowerCase() : '';
 50     },
 51 
 52     /**
 53      * 12345 => $12,345.00
 54      *
 55      * @param {String} sign
 56      */
 57 
 58     currency: function currency(value, _currency) {
 59       value = parseFloat(value);
 60       if (!isFinite(value) || !value && value !== 0) return '';
 61       _currency = _currency != null ? _currency : '$';
 62       var stringified = Math.abs(value).toFixed(2);
 63       var _int = stringified.slice(0, -3);
 64       var i = _int.length % 3;
 65       var head = i > 0 ? _int.slice(0, i) + (_int.length > 3 ? ',' : '') : '';
 66       var _float = stringified.slice(-3);
 67       var sign = value < 0 ? '-' : '';
 68       return sign + _currency + head + _int.slice(i).replace(digitsRE, '$1,') + _float;
 69     },
 70 
 71     /**
 72      * 'item' => 'items'
 73      *
 74      * @params
 75      *  an array of strings corresponding to
 76      *  the single, double, triple ... forms of the word to
 77      *  be pluralized. When the number to be pluralized
 78      *  exceeds the length of the args, it will use the last
 79      *  entry in the array.
 80      *
 81      *  e.g. ['single', 'double', 'triple', 'multiple']
 82      */
 83 
 84     pluralize: function pluralize(value) {
 85       var args = toArray(arguments, 1);
 86       return args.length > 1 ? args[value % 10 - 1] || args[args.length - 1] : args[0] + (value === 1 ? '' : 's');
 87     },
 88 
 89     /**
 90      * Debounce a handler function.
 91      *
 92      * @param {Function} handler
 93      * @param {Number} delay = 300
 94      * @return {Function}
 95      */
 96 
 97     debounce: function debounce(handler, delay) {
 98       if (!handler) return;
 99       if (!delay) {
100         delay = 300;
101       }
102       return _debounce(handler, delay);
103     }
104   };