<html><script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script><body><div ng-app="myApp" ng-controller="nCtrl"><h1>{{weight | number : 3}} kg</h1></div><script>var app = angular.module('myApp', []);app.controller('nCtrl', function($scope) { $scope.weight = 9999;});</script><p>重量被写成三位小数。</p></body></html>