1. <!DOCTYPE html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    6.     <title>Document</title>
    7. </head>
    8. <body>
    9.     <input type="text" id="input" value="hello world">
    10.     <script>
    11.         // element.value
    12.         var input = document.getElementById("input");
    13.         input.onkeyup = function(event){
    14.             if(event.keyCode ==13){
    15.                 console.log(this.value)
    16.             }
    17.         }
    18.     </script>
    19. </body>
    20. </html>

    1.PNG