有没有一种方法来创建一个JavaScript的字符串函数？ [英] Is there a way to create a function from a string with javascript?

问题描述

例如;

  var s =function test（）{
 alert（1）; 
}; 
 
 var fnc = aMethod（s）; 
  

如果这是字符串，我想要一个叫做fnc的函数。

eval（alert（1）） fnc（）; > pops alert screen。

;）不解决我的问题。

解决方案

通过使用 Function ：

  var fn = Function（alert（ '你好'））; 
 fn（）; 
  

当前范围中的变量（如果不是全局变量）不适用于

传递参数也是可能的：

  var addition = Function（a，b，return a + b;）; 
 alert（addition（5，3））; //显示'8'
  

For example;

var s = "function test(){
  alert(1);
}";

var fnc = aMethod(s);

If this is the string, I want a function that's called fnc. And fnc(); pops alert screen.

eval("alert(1);") doesnt solve my problem.

解决方案

A better way to create a function from a string is by using Function:

var fn = Function("alert('hello there')");
fn();

This has as advantage / disadvantage that variables in the current scope (if not global) do not apply to the newly constructed function.

Passing arguments is possible too:

var addition = Function("a", "b", "return a + b;");
alert(addition(5, 3)); // shows '8'

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