Question

我想检测用户何时按下了不是“输入”按钮的键。例如：如果用户按下“ Shift”键，它将执行某些操作。我有以下代码，但无法正常工作：

$(document).keypress(function(e) {
var keycode = (e.keyCode ? e.keyCode : e.which);
if (keycode!= '13) {
  //do somthing
  }
});

Answer 1

KeyboardEvent.keyCode和KeyboardEvent.which均已弃用（我知道这令人困惑）。像这样使用KeyboardEvent.code：

$(document).keypress(function(e){
  if(e.code !== "Enter"){
    // Your code here
  }
});

更多信息，请访问MDN

Answer 2

尝试

<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <script type="text/javascript">
    $(function() {
      document.onkeydown = function(e) {
        if (!e.shiftKey) {
          alert("You have entered a key that was not shift");
        }
      };

    });
  </script>

</head>

<body>
  Please try to enter a key.
</body>

</html>

检测不是在JavaScript中“输入”的按键事件

2 个答案: