Difference between == and === in JavaScript

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  <title>Difference between == and === in JavaScript</title>
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  <script>
    // alert(0 == false); // return true, because both are same type.
    // alert(0 === false); // return false, because both are of a different type.
    // alert(1 == "1"); // return true, automatic type conversion for value only.
    // alert(1 === "1"); // return false, because both are of a different type.
    // alert(null == undefined); // return true.
    // alert(null === undefined); // return false.
    // alert('0' == false); // return true.
    // alert('0' === false); // return false.
    // alert(1=== parseInt("1")); // return true.

    console.log(0 == false); // return true, because both are same type.
    console.log(0 === false); // return false, because both are of a different type.
    console.log(1 == "1"); // return true, automatic type conversion for value only.
    console.log(1 === "1"); // return false, because both are of a different type.
    console.log(null == undefined); // return true.
    console.log(null === undefined); // return false.
    console.log('0' == false); // return true.
    console.log('0' === false); // return false.
    console.log(1 === parseInt("1")); // return true.
  </script>
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  <h3>Difference between == and === in JavaScript</h3>
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