Picking a random color from array

This question already has an answer here:

Change an element's class with JavaScript 30 answers

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To use a javascript variable as an HTML value, you have to set it in javascript. So to set your value attribute, do it like this: And you need to wrap the code in the function that you set in the onClick

<script>
    function addObject(){    
       var colorArray = ['.st1', '.st2', '.st3', '.st4'];
        var randomColor = Math.floor(Math.random() * colorArray.length);
        console.log(colorArray[randomColor]);
        document.getElementById("new-class").className = colorArray[randomColor];
    }
</script>

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