javascript onclick

1document.getElementById("myBtn").addEventListener("click", function() {
2  alert("Hello World!");
3});

1var element = document.getElementById("elem");
2element.onclick = function(event) {
3  console.log(event);
4}

1 document.getElementById("Save").onclick = function ()
2    {
3     alert("hello");
4     //validation code to see State field is mandatory.  
5    }

1var myElem = document.getElementByID('ElemID');
2myElem.onclick = function() {
3	//do stuff
4}

1// The element id (TheElementID) and var name (myElement) can be named anything.
2var myElement = document.getElementByID('TheElementID');
3myElement.onclick = function() {
4	// Carry out a function here...
5}

1<button onclick="activateLasers()">
2   Activate Lasers
3</button>