Javascript - 使用字符串连接设置变量 [英] Javascript - set a variable using concatenation of strings

问题描述

是否可以通过将两个字符串连接在一起形成名称来设置变量？

Is it possible to set a variable by concatenating two strings together to form the name?

如果可能的话，我想根据用户点击的对象的类名确定要设置的变量。我知道我可以硬编码一堆if / else if语句，但如果我可以间接引用变量，那将会非常酷。我在想这样的事情：

If at all possible I'd like to determine what variable to set based on the class names of the objects that the user clicks. I know I can hard code a bunch of if/else if statements, but it would be really cool if I could reference the variables indirectly. I was thinking something like this:

var owner_read;
var group_read;

function setVariableIndirectly(object){
    var second = object.className; // returns "read"
    var first = object.parentElement.className; // returns "group"

    first + "_" + second = "set this as the new variable";
}

有没有办法做到这一点??

Is there any way of doing this??

编辑：

这是数据来自的html。

Here's the html that the data is coming in from.

<p class="owner">
    <span class="read" onclick="permissionClick(this)">r</span>
    <span class="write" onclick="permissionClick(this)">w</span>
    <span class="execute" onclick="permissionClick(this)">x</span>
</p>

推荐答案

目前尚不清楚你要完成的是什么，但您可以按名称访问变量作为对象的属性。

It's not clear exactly what you're trying to accomplish, but you can access variables by name as properties of an object.

// this is the container to hold your named variables 
//    (which will be properties of this object)
var container = {};

function setVariableIndirectly(obj){
    var second = obj.className; // returns "read"
    var first = obj.parentNode.className; // returns "group"

    // this is how you access a property of an object 
    //    using a string as the property name    
    container[first + "_" + second] = "set this as the new variable";

   // in your example container["read_group"] would now be set
}

如上所示，将变量放在您自己的容器对象上可能更好，但您也可以通过窗口对象上的属性访问全局变量。

It's probably better to put your variables on your own container object as shown above, but you can also access global variables via properties on the window object.

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