Question

我正在开展学校项目

如何访问变量名称并将其存储在另一个变量ex：y [i]。

中

在javascript代码中用什么来代替评论。

var p = ["a","b","d"];

var q = ["d","b","c"];

var value = "d";

var x = [];
var y = [];


function testArrays(needle, arrays) {
  for (var i=0; i<arrays.length; i++) {
    x[i] = arrays[i].indexOf(value); 
   // y[i] = // store array`s name here
    
  }
  document.getElementById("demo").innerHTML = x + y;

}

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
  <p>Click the button to display the position of the element "Apple":</p>

<button onclick="testArrays(value, [p, q])">Try it</button>

<p id="demo"></p>
</body>
</html>

Answer 1

以下是您搜索的内容：您必须使用数组构造一个对象并传递所有数组。

var obj = {
  p:["a","b","d"],
  q: ["d","b","c"]
};
var value = "d";

var x = [];
var y = [];


function testArrays(needle, arrays) {
    for(key in arrays){
       x.push(arrays[key].indexOf(value));
       y.push(key); 
    }
  document.getElementById("demo").innerHTML = x + y;

}

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
  <p>Click the button to display the position of the element "Apple":</p>

<button onclick="testArrays(value, obj)">Try it</button>

<p id="demo"></p>
</body>
</html>

Answer 2

因为你问我在说什么。我会给你代码。再次，为了重新迭代我的观点，你无法得到变量名。但是如果你必须以某种方式获得变量，你可以通过将所有需要访问的变量放在一个对象中来解决。

您不会获得对象的变量名称，但您可以访问此对象的所有属性名称。

Here is the codepen link to see the code running.

HTML

<p id="test"><p>

JS

var variableList = {};

variableList.var1 = 1;
variableList.var2 = -50;
variableList.var3 = [2,4];
variableList.var4 = "4";
variableList.var5 = 5.5;

var ele = document.getElementById("test");
for(var propertyName in variableList) {
   ele.innerHTML = ele.innerHTML + "<br>" + propertyName + " : " + variableList[propertyName];
}

如何将变量的名称存储在另一个变量

2 个答案: