global variable, anonymous function attribute : It called attribute within object JavaScript 2021.01.07
typeof, .indexof(), ===, prompt(), <br />, document.write(), for, continue, anonymous function typeof : return the data type > typeof 1 typeof "1" 'code'.indexOf('d') 1==="1" 1=="1" < true true : 1, -1, 'some string' false : none 1, ' .. JavaScript 2021.01.06
