2019独角兽企业重金招聘Python工程师标准>>> 
ng
ng (核心模块)
这个ng模块是当AngularJS应用启动的时候默认加载的。这个模块自己包含了一个AngularJS应用工作必需的组件。下面的表格用等级的分类列出了核心模块中可用的每个services/factories,filters,directives和测试组件。
Module Components
Function
| Name | Description |
|---|---|
| angular.lowercase | 转换特定的字符串为小写形式 |
| angular.uppercase | 转换特定的字符串为大写形式 |
| angular.forEach | 为obj集合中的每个项执行iterator函数，obj可以是一个对象或者是数组。这个iterator函数执行基于iterator(value,key,obj)结构的函数，value是一个对象的属性或者是数组的元素，key是对象的key或者是数组中的index，或者是obj自己。指定一个context给这个函数是可选的，context将作为iterator函数的this。 |
| angular.extend | 扩展目标对象dst，使用从src对象复制可枚举属性到dst。我可以指定多个src对象。如果你想要保留原始的对象，你可以通过一个空的目标对象实现：var object = angular.extend({}, object1, object2)。注意：记住angular.extend不支持递归合并（深度copy）。 |
| angular.noop | 这个函数不执行任何的操作。这个函数可以用于当需要一个函数风格的代码时。 |
| angular.identity | 这个函数返回它的第一个参数。这个函数在编写函数形式的代码时有用 |
| angular.isUndefined | 判断一个变量是未声明的 |
| angular.isDefined | 判断一个变量是已经声明的 |
| angular.isObject | 判断一个引用是否是一个对象。不同于typeof关键字，null不被看作一个对象。注意，数组是对象。 |
| angular.isString | 判断一个引用是不是一个字符串对象 |
| angular.isNumber | 判断一个变量是不是数字对象 |
| angular.isDate | 判断一个值是不是date |
| angular.isArray | 判断一个变量是数组 |
| angular.isFunction | 判断一个引用是函数 |
| angular.isElement | 判断一个引用是一个dom元素或者是被jquery包装过的元素 |
| angular.copy | 创建一个对象的深度拷贝，它可以是一个对象或者是数组 |
| angular.equals | 判断如果两个对象或者两个值是否相同。支持值类型，正则表达式，数组和对象。 |
| angular.bind | 返回一个函数fn，绑定了self参数为这个函数的this。你可以再传递一个args参数预先绑定到这个函数上。这个特性也称为局部应用，区别与函数柯里化。这里的柯里化很难理解，还没有理解是怎么一回事。 |
| angular.toJson | 序列化对象为JSON格式的字符串。属性如果以$$开头，则会被排除，因为angular内部使用这个标记。 |
| angular.fromJson | 反序列化JSON字符串为对象。 |
| angular.bootstrap | 使用这个函数去手动启动angular应用。 |
| angular.reloadWithDebugInfo | 使用这个函数去开启debug信息重新加载当前的应用。这个方式优先与调用$compileProvider.debugInfoEnabled(false)。 |
| angular.injector | 创建一个注射器对象它能够用于获取service的同时注入依赖（了解依赖注入） |
| angular.element | 包装一个原始的DOM元素或者HTML字符串为一个jQuery的元素。 |
| angular.module | angular.module是一个全局的用于创建、注册、获取angular模块。所有的模块（核心模块或者是第三方的）可用需要应用使用这个机制注册了这些模块。 |
Directive
| Name | Description |
|---|---|
| ngApp | Use this directive to auto-bootstrap an AngularJS application. The ngApp directive designates the root element of the application and is typically placed near the root element of the page - e.g. on the |
| a | Modifies the default behavior of the html A tag so that the default action is prevented when the href attribute is empty. 修改html的a标签的默认行为，所以当href为空白的时候，会阻止默认的行为。 |
| ngHref | Using Angular markup like {{hash}} in an href attribute will make the link go to the wrong URL if the user clicks it before Angular has a chance to replace the {{hash}} markup with its value. Until Angular replaces the markup the link will be broken and will most likely return a 404 error. The ngHref directive solves this problem. 使用Angular标记类似于{{hash}}在一个href属性中，如果点击的时机早于Angular替换{{hash}}标记将导致连接到错误的URL。直到Angular替换这个标签前这个连接将失败，最可能返回404错误。这个ngHref指令解决这个问题。 |
| ngSrc | Using Angular markup like {{hash}} in a srcattribute doesn't work right: The browser will fetch from the URL with the literal text {{hash}}until Angular replaces the expression inside{{hash}}. The ngSrc directive solves this problem. 使用Angular 标记例如{{hash}}在一个src属性中不能正确工作：浏览器将从带有{{hash}}的URL中获取资源直到Angular替换了这个表达式。使用ngSrc指令可以解决这个问题。 |
| ngSrcset | Using Angular markup like {{hash}} in asrcset attribute doesn't work right: The browser will fetch from the URL with the literal text{{hash}} until Angular replaces the expression inside {{hash}}. The ngSrcset directive solves this problem. 使用Angular 标记例如{{hash}}在一个srcset属性中不能正确工作：浏览器将从带有{{hash}}的URL中获取资源直到Angular替换了这个表达式。使用ngSrcset指令可以解决这个问题。 |
| ngDisabled | This directive sets the disabled attribute on the element if the expression inside ngDisabledevaluates to truthy. 如果元素上的ngDisabled表达式计算后得出真，这个指令将设置disabled指令到元素上 |
| ngChecked | The HTML specification does not require browsers to preserve the values of boolean attributes such as checked. (Their presence means true and their absence means false.) If we put an Angular interpolation expression into such an attribute then the binding information would be lost when the browser removes the attribute. The ngChecked directive solves this problem for the checked attribute. This complementary directive is not removed by the browser and so provides a permanent reliable place to store the binding information. HTML的规范没有规定浏览器保存checked的boolean值。（当checked有的时候代表true，没有checked的时候表示false），如果我们放了一个angular 插值表达式到一个属性中来绑定这个信息，当浏览器删除这个属性的时候我们将失去绑定关系。ngChecked指令用来解决checked属性的这个问题，这个补充指令不会在浏览器删除因为它提供了一个可靠的位置去存储绑定信息。 |
| ngReadonly | The HTML specification does not require browsers to preserve the values of boolean attributes such as readonly. (Their presence means true and their absence means false.) If we put an Angular interpolation expression into such an attribute then the binding information would be lost when the browser removes the attribute. The ngReadonly directive solves this problem for the readonly attribute. This complementary directive is not removed by the browser and so provides a permanent reliable place to store the binding information. |
| ngSelected | The HTML specification does not require browsers to preserve the values of boolean attributes such as selected. (Their presence means true and their absence means false.) If we put an Angular interpolation expression into such an attribute then the binding information would be lost when the browser removes the attribute. The ngSelected directive solves this problem for the selected attribute. This complementary directive is not removed by the browser and so provides a permanent reliable place to store the binding information. |
| ngOpen | The HTML specification does not require browsers to preserve the values of boolean attributes such as open. (Their presence means true and their absence means false.) If we put an Angular interpolation expression into such an attribute then the binding information would be lost when the browser removes the attribute. ThengOpen directive solves this problem for theopen attribute. This complementary directive is not removed by the browser and so provides a permanent reliable place to store the binding information. |
| ngForm | Nestable alias of form directive. HTML does not allow nesting of form elements. It is useful to nest forms, for example if the validity of a sub-group of controls needs to be determined. |
| form | Directive that instantiates FormController. |
| textarea | HTML textarea element control with angular data-binding. The data-binding and validation properties of this element are exactly the same as those of the input element. |
| input | HTML input element control. When used together with ngModel, it provides data-binding, input state control, and validation. Input control follows HTML5 input types and polyfills the HTML5 validation behavior for older browsers. |
| ngValue | Binds the given expression to the value ofinput[radio], so that when the element is selected, the ngModel of that element is set to the bound value. |
| ngBind | The ngBind attribute tells Angular to replace the text content of the specified HTML element with the value of a given expression, and to update the text content when the value of that expression changes. |
| ngBindTemplate | The ngBindTemplate directive specifies that the element text content should be replaced with the interpolation of the template in thengBindTemplate attribute. Unlike ngBind, thengBindTemplate can contain multiple {{ }}expressions. This directive is needed since some HTML elements (such as TITLE and OPTION) cannot contain SPAN elements. |
| ngBindHtml | Evaluates the expression and inserts the resulting HTML into the element in a secure way. By default, the resulting HTML content will be sanitized using the $sanitize service. To utilize this functionality, ensure that $sanitize is available, for example, by including ngSanitizein your module's dependencies (not in core Angular). In order to use ngSanitize in your module's dependencies, you need to include "angular-sanitize.js" in your application. |
| ngChange | Evaluate the given expression when the user changes the input. The expression is evaluated immediately, unlike the JavaScript onchange event which only triggers at the end of a change (usually, when the user leaves the form element or presses the return key). |
| ngClass | The ngClass directive allows you to dynamically set CSS classes on an HTML element by databinding an expression that represents all classes to be added. |
| ngClassOdd | The ngClassOdd and ngClassEven directives work exactly as ngClass, except they work in conjunction with ngRepeat and take effect only on odd (even) rows. |
| ngClassEven | The ngClassOdd and ngClassEven directives work exactly as ngClass, except they work in conjunction with ngRepeat and take effect only on odd (even) rows. |
| ngCloak | The ngCloak directive is used to prevent the Angular html template from being briefly displayed by the browser in its raw (uncompiled) form while your application is loading. Use this directive to avoid the undesirable flicker effect caused by the html template display. |
| ngController | The ngController directive attaches a controller class to the view. This is a key aspect of how angular supports the principles behind the Model-View-Controller design pattern. |
| ngCsp | Enables CSP (Content Security Policy) support. |
| ngClick | The ngClick directive allows you to specify custom behavior when an element is clicked. |
| ngDblclick | The ngDblclick directive allows you to specify custom behavior on a dblclick event. |
| ngMousedown | The ngMousedown directive allows you to specify custom behavior on mousedown event. |
| ngMouseup | Specify custom behavior on mouseup event. |
| ngMouseover | Specify custom behavior on mouseover event. |
| ngMouseenter | Specify custom behavior on mouseenter event. |
| ngMouseleave | Specify custom behavior on mouseleave event. |
| ngMousemove | Specify custom behavior on mousemove event. |
| ngKeydown | Specify custom behavior on keydown event. |
| ngKeyup | Specify custom behavior on keyup event. |
| ngKeypress | Specify custom behavior on keypress event. |
| ngSubmit | Enables binding angular expressions to onsubmit events. |
| ngFocus | Specify custom behavior on focus event. |
| ngBlur | Specify custom behavior on blur event. |
| ngCopy | Specify custom behavior on copy event. |
| ngCut | Specify custom behavior on cut event. |
| ngPaste | Specify custom behavior on paste event. |
| ngIf | The ngIf directive removes or recreates a portion of the DOM tree based on an {expression}. If the expression assigned to ngIfevaluates to a false value then the element is removed from the DOM, otherwise a clone of the element is reinserted into the DOM. |
| ngInclude | Fetches, compiles and includes an external HTML fragment. |
| ngInit | The ngInit directive allows you to evaluate an expression in the current scope. |
| ngList | Text input that converts between a delimited string and an array of strings. The default delimiter is a comma followed by a space - equivalent to ng-list=", ". You can specify a custom delimiter as the value of the ngListattribute - for example, ng-list=" | ". |
| ngModel | The ngModel directive binds an input,select,textarea (or custom form control) to a property on the scope using NgModelController, which is created and exposed by this directive. |
| ngModelOptions | Allows tuning how model updates are done. Using ngModelOptions you can specify a custom list of events that will trigger a model update and/or a debouncing delay so that the actual update only takes place when a timer expires; this timer will be reset after another change takes place. |
| ngNonBindable | The ngNonBindable directive tells Angular not to compile or bind the contents of the current DOM element. This is useful if the element contains what appears to be Angular directives and bindings but which should be ignored by Angular. This could be the case if you have a site that displays snippets of code, for instance. |
| ngPluralize | ngPluralize is a directive that displays messages according to en-US localization rules. These rules are bundled with angular.js, but can be overridden (see Angular i18n dev guide). You configure ngPluralize directive by specifying the mappings between plural categories and the strings to be displayed. |
| ngRepeat | The ngRepeat directive instantiates a template once per item from a collection. Each template instance gets its own scope, where the given loop variable is set to the current collection item, and $index is set to the item index or key. |
| ngShow | The ngShow directive shows or hides the given HTML element based on the expression provided to the ngShow attribute. The element is shown or hidden by removing or adding the.ng-hide CSS class onto the element. The.ng-hide CSS class is predefined in AngularJS and sets the display style to none (using an !important flag). For CSP mode please addangular-csp.css to your html file (see ngCsp). |
| ngHide | The ngHide directive shows or hides the given HTML element based on the expression provided to the ngHide attribute. The element is shown or hidden by removing or adding theng-hide CSS class onto the element. The.ng-hide CSS class is predefined in AngularJS and sets the display style to none (using an !important flag). For CSP mode please addangular-csp.css to your html file (see ngCsp). |
| ngStyle | The ngStyle directive allows you to set CSS style on an HTML element conditionally. |
| ngSwitch | The ngSwitch directive is used to conditionally swap DOM structure on your template based on a scope expression. Elements within ngSwitchbut without ngSwitchWhen or ngSwitchDefaultdirectives will be preserved at the location as specified in the template. |
| ngTransclude | Directive that marks the insertion point for the transcluded DOM of the nearest parent directive that uses transclusion. |
| script | Load the content of a
|