將變量傳遞給函數範圍

Question

是否有可能以其他方式執行以下操作，而不傳遞參數？

var f = function(){ 
    console.log(v); 
} 

var original = f; 

f = function(){ 
    var v = "test"; 
    original(); 
}; 

// the following line is called by 3rd party code 
f(); // it errors out here - v is not defined 

Answer 1

讓var v爲globel變量

var v ; 
 
var f = function(){ 
 
    v="new test" 
 
    console.log(v); 
 
} 
 

 
var original = f; 
 

 
f = function(){ 
 
    v = "test"; 
 
    original(); 
 
}; 
 

 
f();//f function 
 
original();//original function also working

Answer 2

使用可以使用JavaScript閉包這裏

function f() { 
    var v = 'test'; 
    return (function() { 
     console.log(v) 
    })(); 
} 

Answer 3

另一種方法在這裏：

var f = function(){ 
    console.log(arguments[0]); 
}; 

f = f.bind(null, 'test'); 

f();