How can I write a citizen? Rotate a 3 * 3 matrix 90 degrees with one click with javascript

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Javascript

JavaSE6

var matrix=[1,2,3,4,5,6,7,8,9]

What I have tried:

function(){
var x=document.getElementByTagName('input');
var y=x.length;
[x[0],x[2]]=[x[2],x[0]];
x.innerHTML=x;
}