//过滤 不带参赛
app.filter('ordinal', function () {return function (number) {if (isNaN(number) || number < 1) {return number;} else {var lastDigit = number % 10;if (lastDigit === 1) {return number + 'st'} else if (lastDigit === 2) {return number + 'nd'} else if (lastDigit === 3) {return number + 'rd'} else if (lastDigit > 3) {return number + 'th'}}}
});

//过滤 带参赛
app.filter('capitalize', function () {//input 需要过滤的元素//char位置，索引减一return function (input, char) {if (isNaN(input)) {//如果序号位置没有设置，索引位置默认是0var char = char - 1 || 0;//把过滤元素索引位置上的字母转换成大写var letter = input.charAt(char).toUpperCase();var out = [];for (var i = 0; i < input.length; i++) {if (i == char) {out.push(letter);} else {out.push(input[i]);}}return out.join('');} else {return input;}}
});

var app = angular.module('filters', []);app.controller('demo', function ($scope) {$scope.languages = [{name: 'C#', type: 'static'},{name: 'PHP', type: 'dynamic'},{name: 'Go', type: 'static'},{name: 'JavaScript', type: 'dynamic'},{name: 'Rust', type: 'static'}];
});//过滤集合
app.filter('staticLanguage', function () {return function (input) {var out = [];angular.forEach(input, function (language) {if (language.type === 'static') {out.push(language);}});return out;}
});

var app = angular.module('filters', []);app.controller('demo', function ($scope) {$scope.digit = 29.88;
});//过滤 做多件事 多个参赛
app.filter('customCurrency', function () {return function (input, symbol, place) {if (isNaN(input)) {return input;} else {//检查symbol是否有实参var symbol = symbol || '￥';var place = place === undefined ? true : place;if(place===true){return symbol+input;}else{return input + symbol;}}}
});

<p><strong>Original:</strong></p>
<ul><li>{{digit}}</li></ul>
<p><strong>Custom Currency Filter</strong></p>
<ul><li>{{digit | customCurrency}} --Default</li><li>{{digit | customCurrency:'元'}} --custom symbol</li><li>{{digit | customCurrency:'元':false}} -- custom symbol and custom location</li>
</ul>