Angular 手动解析表达式

时间：2022-09-28 19:09:10
<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <title></title>

    <script src="js/angular.min.js"></script>

    <script>

        angular.module("myApp", []).controller('MyController', function($scope, $parse) {

            $scope.a = 'test'

            $scope.$watch('expr', function(newVal, oldVal, scope) {

                if (newVal !== oldVal) {

                    // 用该表达式设置parseFun

                    var parseFun = $parse(newVal)

                    console.log($parse('a+2')(scope))

                    // 获取经过解析后表达式的值

                    $scope.parsedValue = parseFun(scope)

                }

            })

        })

    </script>

</head>

<body ng-app="myApp">

    <div ng-controller="MyController">

        <input ng-model="expr" type="text" placeholder="Enter an expression">

        {{ parsedValue }}

    </div>

</body>

</html>

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