Question

我希望用户可以通过在textarea中写下它的名字来查看变量的值，简化：

var money = "300$";
var input = "money"; //user wants to see money variable

alert(input); //This would alert "money"

甚至可以输出（在此示例中）＆＃34; 300 $＆＃34;？

感谢您的帮助！

Answer 1

使用对象作为关联数组，而不是单独的变量。

var variables = {
    'money': '300$'
}
var input = 'money';
alert(variables[input]);

Answer 2

您可以使用一个对象，然后在该对象上定义一个变量作为该对象的属性：

var obj = {}, input;

obj.money = "300$";
input = "money";
alert(obj[input]);

obj.anotherMoney = "400$";
input = "anotherMoney";
alert(obj[input]);

Answer 3

一种简单的方法，你仍然可以尝试这个：

 var money = "300$";
 var input = "money"; //user wants to see money variable

 alert(eval(input)); //This would alert "money"

Answer 4

以下是按照要求使用textarea的答案。

JSFiddle http://jsfiddle.net/7ZHcL/

HTML

<form action="demo.html" id="myForm">
    <p>
        <label>Variable name:</label>
        <textarea id="varWanted" name="varWanted" cols="30" rows="1"></textarea>
    </p>
    <input type="submit" value="Submit" />
</form>
<div id="result"></div>

<强> JQuery的

$(function () {
    // Handler for .ready() called.
    var variables = {
        'money': '300$',
            'date_now': new Date()
    }
    //Detect all textarea's text variation
    $("#varWanted").on("propertychange keyup input paste", function () {
        //If the text is also a key in 'variables', then it display the value
        if ($(this).val() in variables) {
            $("#result").html('"' + $(this).val() + '" = ' + variables[$(this).val()]);
        } else {
            //Otherwise, display a message to inform that the input is not a key
            $("#result").html('"' + $(this).val() + '" is not in the "variables" object');
        }
    })
});

通过用户输入获取变量

4 个答案: