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https://www.w3schools.com/js/tryit.asp?filename=tryjs_datatypes_null <!DOCTYPE html> <html> <body> <h2>JavaScript</h2> <p>Objects can be emptied by setting the value to <b>null</b>.</p> <p id="demo"></p> <script> var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; person = null; document.getElementById("demo").innerHTML = typeof person; </script> </body> </html> ' oppure https://www.w3schools.com/js/tryit.asp?filename=tryjs_datatypes_undefined_1 <!DOCTYPE html> <html> <body> <h2>JavaScript</h2> <p>Objects can be emptied by setting the value to <b>undefined</b>.</p> <p id="demo"></p> <script> var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; person = undefined; document.getElementById("demo").innerHTML = person; </script> </body> </html> |