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문자

AngularJS: API: ng/directive/ngCsp

ngCsp

  1. - directive in module ng

激活CSP (Content Security Policy,上下文安全策略) 支持。

这是开发像Google Chrome Extensions等东西时所必须的。

CSP禁止应用使用 evalFunction(string) 生成的函数 (以及其它东西)。让 Angular兼容CSP我们只要做两件不同的事:

  • 不要使用Function构造来生成优化的值获取(value getters)
  • 不要注入定制的样式表到文档

AngularJS 使用 Function(string) 生成函数来优化速度。使用 ngCsp 指令会引起Angular使用CSP兼容模式。 当AngularJS处于这个模式时,计算所有表达式的速度会比非CSP模式慢30%,但是不会发生安全违规行为。

CSP禁止JavaScript内联样式表规则。在非CSP模式,Angular自动包含一些CSS规则(例如ngCloak)。为了使这些指令能在CSP模式下工作,请手工包含angular-csp.css

Angular尝试自动检测CSP是否激活来自动打开CSP安全模式。这个自动检测会引发一个CSP错误并输出到控制台:

Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of
script in the following Content Security Policy directive: "default-src 'self'". Note that
'script-src' was not explicitly set, so 'default-src' is used as a fallback.

这个错误是无害的,但很讨厌。为了防止错误显示,放置ngCsp指令到应用的根元素上,或放在angular.js 脚本标签中,不管哪种方式,必须是在html文档中最先出现。

注意:这个指令只会在ng-cspdata-ng-csp 属性表单中生效。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为属性使用:
    <html>
    ...
    </html>

示例

这个例子演示如何放置 ngCsp指令到 html标签上。

     <!doctype html>
     <html ng-app ng-csp>
     ...
     ...
     </html>

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