怎么获取当前的value值,用console.log()来每次输出value的值

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" id="aaa">
</body>

</html>


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微积分2016

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <input type="text" id="t1" /> <script type="text/javascript"> var init=function () {     var t1=document.getElementById("t1");          t1.oninput=function () {         console.log(t1.value);     };     // IE     t1.onpropertychange=function () {         console.log(t1.value);     }; }; window.onload=init; </script> </body> </html>

千秋此意

<!DOCTYPE html> <html> <head>     <meta charset="UTF-8">     <title>Title</title> </head> <body>     <input type="text" id="aaa">     <script>     var input = document.getElementById('aaa');     var timer = null;     input.onkeyup = function() {         clearTimeout(timer);         timer = setTimeout(function() {             console.log(input.value);         }, 500);     }     </script> </body> </html>
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JavaScript