Count Click Only Once

Please take a look here:

var clicks = 0;
function clickME(el) {
   el.disabled = true;
   clicks += 1;
   document.getElementById("clicks").innerHTML = clicks;
}

<p>Clicks: <a id="clicks">0</a></p>
<button type="button" onClick="clickME(this)">Click me</button>
<button type="button" onClick="clickME(this)">Click me</button>
<button type="button" onClick="clickME(this)">Click me</button>
<button type="button" onClick="clickME(this)">Click me</button>

Tags:

Javascript

Html

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