js，将字符串转换为函数 [英] js, turn string to function

问题描述

我想知道如何将字符串转换为包装函数。

我有一个字符串函数数据

  var a = new String（alert（turned））; 
  

我想将a变成一个包装函数

  a = function（）{a}; //失败
 
 a = function（）{eval（a）}; //失败
 
 var b = a; 
 $ ba = function（）{eval（b）} //成功
  

我想知道人们通常会做什么来将其转换为包装函数。

非常感谢您的建议。

解决方案

您也可以像这样使用带有 new 关键字的函数构造函数。

  var a = new String（alert（'hello'））; 
a = new函数（a）
a（）
  

会导致警报'hello'

你甚至可以使用这个接受参数的方法创建一个新的函数。请参阅 https://developer.mozilla.org/en-US / docs / JavaScript / Reference / Global_Objects / Function

但是我会小心你变成一个函数。您不希望用户能够执行代码。

I want to know how can i turn string into a wrap function.

I have a string function data

var a = new String("alert(turned)");

And I want to turn a into a wrapped function

a = function(){ a }; // failed

a = function(){ eval(a) };  // failed

var b = a;

a = function(){ eval(b) } // success

I want to know what do people will do in general to turn a into a wrapped function.

Thank you very much for your advice.

解决方案

You can also use the function constructor with the new keyword like this.

var a = new String("alert('hello')");
a = new Function(a)
a()

Would result in an alert box with 'hello'

You can even make a new function using this method which accepts arguments. see here https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function

But I would be careful about what you turn into a function. You don't want users to be able to execute code.

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