angular.js - angular作用域
PHP中文网
PHP中文网 2017-05-15 16:58:35
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今天学习指令,遇到了一些困惑:

    <!DOCTYPE html>
<html ng-app="app">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <link rel="stylesheet" href="../css/lib/bootstrap4.css">

    <script type="text/javascript" src='../js/lib/angular.js' ></script>
    <script type="text/javascript" src='js/scope2.js'></script>
</head>

<body>
    
    <p ng-init = 'someProperty="some date"'>
    
        <p ng-init='siblingProperty="moredata"'>
            Inside p Two : {{aThirdProperty}}
    
            <p ng-init="aThirdProperty='data for 3rd property'" ng-controller="someCtrl">
                Inside p Three: {{aThirdProperty}}
    
                    <p ng-controller="secondCtrl">
                        Inside p Four: {{aThirdProperty}}
                        <br>
                        OutSide myDirective: {{myProperty}}
                        <p my-directive ng-init="myProperty='wow! that is cool'">
                            Inside myDirective : {{myProperty}}
                        </p>

                    </p>

            </p>

        </p>
    
    </p>
    
</body>
</html>

js

    var app = angular.module('app', []);
app.controller('someCtrl', ['$scope', function($scope){

    
}])

app.controller('secondCtrl', ['$scope', function($scope){
    console.log($scope.myProperty)    //undefined
    
}])
app.directive('myDirective',function(){
    return {
        restrict :'A',
        scope:false
        
    }

})

为什么打印出来的是undefined?

然后把js指令里的scope改为scope:{};为什么弹出来的是这个?就是说为什么外面的OutSide myDirective: wow! that is cool会有值?

    Inside p Two :
    Inside p Three: data for 3rd property
    Inside p Four: data for 3rd property 
    OutSide myDirective: wow! that is cool
    Inside myDirective : wow! that is cool
PHP中文网
PHP中文网

认证0级讲师

Antworte allen(3)
过去多啦不再A梦
<p my-directive ng-init="myProperty='wow! that is cool'">
    Inside myDirective : {{myProperty}}
</p>

首先,你写的这个跟指令没多大关系。指令的scope是影响它的template的作用域,这里并不是。

app.controller('secondCtrl', ['$scope', function($scope){
    console.log($scope.myProperty)    //undefined
}])

这里undefined的原因是因为controller在ng-init之前执行了。可以用用延时或者$watch监听

$timeout(function() {
  console.log($scope.myProperty)
});
// or
$scope.$watch('myProperty', function(newVal) {
  console.log($scope.myProperty)
})
阿神

嗯,,,上面那个undefined我懂了,,不过后面那个我还是有点疑惑,,就是说当scope:{}时,Inside myDirective : {{myProperty}}这个表达式还是属于外面那个作用域是不是?而此时template里面并没有设定,,,所以隔离作用域就没有起作用,我这样理解对吗?
还有一个问题,既然这样,,,那为什么如果把scope设定为scope:true是下面这样的结果:

    Inside p Two :
    Inside p Three: data for 3rd property
    Inside p Four: data for 3rd property 
    OutSide myDirective:
    Inside myDirect33ive : wow! that is cool

能否再指点一下,,,谢谢~~

Ty80

scope true就是独立隔离的作用域
{}的话只有{}内部有的属性会被隔离开来

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