正常情况应该显示29%，实际显示28.999999999999996%
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<link rel="stylesheet" href="//apps.bdimg.com/libs/bootstrap/3.3.4/css/bootstrap.min.css">
</head>
<body ng-app="myApp" ng-controller="userCtrl">
<script src="//apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
<div>{{rate*100}}%</div>
<script>
angular.module('myApp', []).controller('userCtrl', function ($scope) {
$scope.rate= 0.29;
})
</script>
</body>
</html>
