cómo comprobar si el elemento dom existe ejemplo de código javascript

Ejemplo 1: existe el elemento js

var element = document.getElementById("test");
    //If it isn't "undefined" and it isn't "null", then it exists.
if(typeof(element) != 'undefined' && element != null){
    alert('Element exists');
} else{
	alert('Element does not exist');
}

Ejemplo 2: comprobar si el elemento existe en javascript

<div id="test">Example DIV element.</div>
 
<script>
    //Attempt to get the element using document.getElementById
    var element = document.getElementById("test");
 
    //If it isn't "undefined" and it isn't "null", then it exists.
    if(typeof(element) != 'undefined' && element != null){
        alert('Element exists!');
    } else{
        alert('Element does not exist!');
    }
</script>

Ejemplo 3: compruebe si el elemento existe en javascript

var myEle = document.getElementById("myElement");
    if(myEle){
        var myEleValue= myEle.value;
    }

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