How to specify value for key in JSON map (in JavaScript)?

I probably am using the wrong terminology here but this is what I'm trying to do. I want to create a map with a value for each key and a value for each key's object. So using this code:

var myMap = {};
var keyVal = "abc";
var objVal = "123";
myMap.keyVal = objVal;

Now what I want to return is a JSON object that looks like {"abc":"123"} but instead it returns {"keyVal":"123"}. How can I get it to use the actual variable contents for the key inste开发者_JS百科ad of the variable name? (or really I guess it's not using the variable at all, just treating 'keyVal' as the key name)

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Use square bracket notation:

myMap[keyVal] = objVal;

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        var datajson = JSON.parse(data);
        var keyArr = Object.keys(datajson);
        for ( var i = 0; i < keyArr.length; i++) {
            var val = datajson[keyArr[i]];
            }

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var keyVal = "abc";
var objVal = "123";
eval("myMap." + keyVal + "='" + objVal + "'")

An alternative, but eval is not recommended