Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-eval'; 但请注意,这样做会降低网站的安全性,因为unsafe-eval允许执行任何字符串作为代码。 方法二:避免使用eval 更安全的方法是避免使用eval(),并寻找替代方案。例如,如果eval()用于解析JSON,可以使用JSON.parse()代替。如果eval()用于...
Summary: Transforming text into executable code with a function such as JavaScript's eval endows programmers with the ability to extend applications, at any time, and in almost any way they choose. But, this expressive power comes at a price: reasoning about the dynamic behavior of programs ...
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<!DOCTYPE html> largeClosures smallClosures evalClosures clearClosures var closures = []; function createLargeClosure() { var largeStr = new Array(1000000).join('x'); return function lC() { return largeStr; }; } function createSmallClosure() { var smallStr = 'x'; var largeS...
myFunction();function myFunction() { "use strict"; y = 3.14; // 报错 (y 未定义)} 1. 2. 3. 4. 5. 6. 为什么使用严格模式: 消除Javascript 语法的一些不合理、不严谨之处,减少一些怪异行为。 消除代码运行的一些不安全之处,保证代码运行的安全。
The Content Security Policy (CSP) prevents the evaluation of arbitrary strings as JavaScript to make it more difficult for an attacker to inject unathorized code on your site. To solve this issue, avoid using eval(), new Function(), setTimeout([string], ...) and setInterval([string], ...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 "use strict";functionsquare(a,a){// 此处报错:Uncaught SyntaxError: Duplicate parameter name not allowed in this contextreturna*a;} 4、eval 语句的作用域是独立的 普通模式下,eval 语句的作用域取决于它所在的位置,而在严格模式下,eval 语句本身就是...
"use strict";function square(a, a) { // 此处报错:Uncaught SyntaxError: Duplicate parameter name not allowed in this contextreturn a * a;} 4、eval 语句的作用域是独立的 普通模式下,eval 语句的作用域取决于它所在的位置,而在严格模式下,eval 语句本身就是一个局部作用域,通过 eval 语句生成的变量...
2. 当进入严格模式时,无论是一个函数声明,还是一个函数表达式,其形参列表中出现 eval或arguments 就要抛出一个SyntaxError异常. 3. 当进入严格模式或一个函数对象内部的代码为strict function code.那么无论是一个函数声明,还是一个函数表达式,其标识符(函数名),如果是eval,或arguments.则抛出一个SyntaxError异常.(...
It would be better to fix it in the repository. Uncaught EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self' 'unsafe-inline'". at Function (<anonymous>) at no...