来自Angularjs文档

Angular normalizes an element's tag and attribute name to determine which elements match which directives. We typically refer to directives by their case-sensitive camelCase normalized name (e.g. ngModel). However, since HTML is case-insensitive, we refer to directives in the DOM by lower-case forms, typically using dash-delimited attributes on DOM elements (e.g. ng-model). The normalization process is as follows: Strip x- and data- from the front of the element/attributes. Convert the :, -, or _-delimited name to camelCase. Here are some equivalent examples of elements that match ngBind:

基于上述陈述，以下所有指令都是有效的

1. ng-bind 2. 吴:绑定 3.ng_bind 4. data-ng-bind 5. x-ng-bind

简短的回答:

Ng-model和data-ng-model是相同和等价的!

Why?

原因:数据前缀 HTML5规范期望任何自定义属性都以data-作为前缀。 原因:ng-model和data-ng-model都是相同和等价的。

AngularJS Document - Normalization Angular normalizes an element's tag and attribute name to determine which elements match which directives. We typically refer to directives by their case-sensitive camelCase normalized name (e.g. ngModel). However, since HTML is case-insensitive, we refer to directives in the DOM by lower-case forms, typically using dash-delimited attributes on DOM elements (e.g. ng-model). The normalization process is as follows: 1. Strip x- and data- from the front of the element/attributes. 2. Convert the :, -, or_-delimited name to camelCase. For example the following forms are all equivalent and match the ngBind directive:

<div ng-controller="Controller">
  Hello <input ng-model='name'> <hr/>
  <span ng-bind="name"></span> <br/>
  <span ng:bind="name"></span> <br/>
  <span ng_bind="name"></span> <br/>
  <span data-ng-bind="name"></span> <br/>
  <span x-ng-bind="name"></span> <br/>
</div>

来自Angularjs文档

Angular normalizes an element's tag and attribute name to determine which elements match which directives. We typically refer to directives by their case-sensitive camelCase normalized name (e.g. ngModel). However, since HTML is case-insensitive, we refer to directives in the DOM by lower-case forms, typically using dash-delimited attributes on DOM elements (e.g. ng-model). The normalization process is as follows: Strip x- and data- from the front of the element/attributes. Convert the :, -, or _-delimited name to camelCase. Here are some equivalent examples of elements that match ngBind:

基于上述陈述，以下所有指令都是有效的

1. ng-bind 2. 吴:绑定 3.ng_bind 4. data-ng-bind 5. x-ng-bind

区别在于自定义data-*属性在HTML5规范中是有效的。因此，如果您需要验证标记，您应该使用它们而不是ng属性。

如果您希望在将HTML或HTML片段提供给浏览器之前在服务器上操作它，那么您肯定希望使用data-ng-xxx属性，而不仅仅是ng-xxx属性。

它使你的html有效，这意味着它可以被html(基于服务器的)解析器使用，如domdocument (php)或其他。这些解析器经常在格式不佳的html上失败。 Angular规范化了这个属性，但请记住，这是在客户端，而不是在服务器端。

好问题。区别很简单——除了某些HTML5验证器会在像ng-app这样的属性上抛出错误外，两者之间绝对没有区别，但它们不会对任何以data-为前缀的属性抛出错误，比如data-ng-app。

所以为了回答你的问题，如果你想验证你的HTML更容易一点，使用data-ng-app。

有趣的事实:你也可以使用x-ng-app达到同样的效果。