angular的查询

<input type="text" ng-model="name" class="cha" />

<input type="button" value="查询" ng-click="cha()" />

//查询
	$scope.cha = function() {
	//每次查询的时候，为了防止第二次失败，需要充值数组
	$scope.persons = [{
	"name": "张三",
	"age": 22,
	"pin": "zhnagsan",
	"zhiwei": "总经理"
	}, {
	"name": "李四",
	"age": 20,
	"pin": "lisi",
	"zhiwei": "总经理"
	}, {
	"name": "杨过",
	"age": 25,
	"pin": "yangguo",
	"zhiwei": "总经理"
	}];
	//新数组
	var newPersons = [];
	var n = $scope.name;
	if (n == "") {
	alert("名字不能为空")
	return;
	}
	//遍历
	for (var i = 0; i < $scope.persons.length; i++) {
	var n1 = $scope.persons[i].name;
	if (n == n1) {
	newPersons.push($scope.persons[i]);
	}
	}
	//判断
	if (newPersons.length == 0) {
	alert("没有匹配项");
	return;
	}
	$scope.persons = newPersons;
	}