javascript-如何通过将用户输入与其键相匹配来显示对象的值? [英] javascript - How to show value from object by matching user input to its key?

问题描述

我想制作将一个代码(用户输入)转换为另一个(预定义)代码的转换工具.我决定将Javascript对象用作代码的容器，并且我的函数将接受用户输入，该输入实际上是javascript对象的键，将其与Code容器中的键匹配，如果找到匹配项，则函数将显示值警报框.

I want to make conversion tool which converts one code (user input) to another (predefined). I decided to use Javascript object as a container for codes, and my function will take user input which is actually a key from a javascript object, match it to the one in Code container and if the match is found, the function will display value to the alert box.

我编写了一个代码，但是它不起作用.我试图找到解决方案，但现在失败了.

I made one code, but it does not work. I tried to find the solution but for now, I failed.

这是我的代码:

$(document).ready(function() {
    $("#convert").click(function(){
        var GardinerToUnicodeCodePoint = {
                        "A1"    :"995328",
                        "A1A"   :"995329",
                        "A1B"   :"995330",
                        "A1C"   :"995331",
                        "A2"    :"995332",
                        "A2A"   :"995333",
                        "A3"    :"995334",
                        "A3A"   :"995335",
                        "A3B"   :"995336",
                        "A4"    :"995337",
                        "A4A"   :"995338",
                        "A4B"   :"995339",
                        "A4C"   :"995340",
                        "A4D"   :"995341",
                        "A4E"   :"995342",
                        "A5"    :"995343",
                        "A5A"   :"995344",
                        "A5B"   :"995345",
                        "A5C"   :"995346",
                        "A6"    :"995347",
        };
        var userInput = $("#userInput").val; /*for example 'A1'*/
        if (userInput in GardinerToUnicodeCodePoint) {
            alert(/*value of key 'userInput' -> 995328*/);
        } else {
            alert("No code found!");
        }
    });
});

推荐答案

调用对象以获取键值对后，可以使用[]:

You can use [] after calling the object to get the key value pair:

GardinerToUnicodeCodePoint[userInput]

将您的代码更改为:

    var userInput = $("#userInput").val; /*for example 'A1'*/
    if (userInput in GardinerToUnicodeCodePoint) {
        alert(GardinerToUnicodeCodePoint[userInput]);
    } else {
        alert("No code found!");
    }

请参阅jsfiddle: https://jsfiddle.net/wy70s3gj/

See jsfiddle: https://jsfiddle.net/wy70s3gj/

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