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<title>JavaScript Logical Operators</title>
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function performLogical() { var a = true;
var b = false;
document.getElementById("and").innerHTML = "a && b: " + (a && b); document.getElementById("or").innerHTML = "a || b: " + (a || b); document.getElementById("notA").innerHTML = "!a: " + (!a); document.getElementById("notB").innerHTML = "!b: " + (!b); }
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<body onload="performLogical()">
<h1>JavaScript Logical Operators</h1>
<p id="and"></p>
<p id="or"></p>
<p id="notA"></p>
<p id="notB"></p>
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