Question

您好可以按名称访问JavaScript变量的值吗？例如：

var MyVariable = "Value of variable";


function readValue(name) {
     ....
}


alert(readValue("MyVariable"));

这是可能的，所以输出是“变量值”吗？如果是，我该如何编写这个函数？

由于

Answer 1

全局变量在window对象上定义，因此您可以使用：

var MyVariable = "Value of variable";
alert(window["MyVariable"]);

Answer 2

是的，你可以这样做：

var MyVariable = "Value of variable";
alert(window["MyVariable"]);

Answer 3

var MyVariable = "Value of variable";    
alert(readValue("MyVariable"));    

// function readEValue(name) { readevalue -> readvalue // always do copy-paste to avoid errors  
function readValue(name) {   
 return window[name]   
}

这就是全部; o）

Answer 4

var sen0=1;
if(window["sen"+n] > 0){
}

Answer 5

试试这个^ _ ^

var MyVariable = "Value of variable";

alert(readValue("MyVariable"));

function readValue(name) {
    return eval(name)
}

Answer 6

我尝试了下面的函数，该函数由Nicolas Gauthier通过Stack Overflow发布，通过命名它来从字符串中获取函数，并且当与变量名一起使用时，它返回变量的值。

它处理点分的变量名（对象的值）。它适用于全局变量和用var声明的变量，但不适用于用'let'定义的变量，在调用函数中不可见。

/***
 * getFunctionFromString - Get function from string
 *
 * works with or without scopes
 *
 * @param  string   string  name of function
 * @return function         by that name if it exists
 * @author by Nicolas Gauthier via Stack Overflow
 ***/
window.getFunctionFromString = function(string)
{
    let scope = window; let x=parent;
    let scopeSplit = string.split('.');
    let i;

    for (i = 0; i < scopeSplit.length - 1; i++)
    {
        scope = scope[scopeSplit[i]];

        if (scope == undefined) return;
    }

    return scope[scopeSplit[scopeSplit.length - 1]];
}

Answer 7

//Ran into this today

//Not what I want
var test = 'someString';
var data = [];
data.push({test:'001'});
console.log(test); --> 'someString';
console.log(data); --> 
 (1) [{…}] 
    0: {test: "001"}        //wrong


//Solution
var obj = {};
obj[test] = '001';
data.push(obj);
console.log(data); -->
(2) [{…}, {…}]
    0: {test: "001"}        //wrong
    1: {someString: "001"}  //correct

按名称访问JavaScript变量的值？

7 个答案: