Sometimes, people send messages from their computer, but how can I find out where the line break was added in their text?
For example, in this text below:
ABC<br>
123
there is an carriage return between C and 1
How can I detect this in JavaScript?
您可以为 keydown 事件编写侦听器。比您将通过事件对象（事件侦听器参数）的 keyCode 属性（ENTER = 13）识别单击的按钮。
<html>
<head>
<script type="text/javascript">
<!--
function onKeyPress(event) {
switch (event.keyCode) {
case 13:
alert("You have clicked ENTER");
break;
default:
}
}
window.onload = function() {
window.addEventListener('keydown', onKeyPress, false);
}
//-->
</script>
</head>
<body></body>
</html>
换行符在 JavaScript 中编码为\n代表 unicode 字符U+0010。回车 ( U+0013) 是\r。您的字符串可以用 JavaScript 编码为：
"ABC\n123";
或者：
"ABC\r\n123";
您还可以使用例如\x10或来通过代码点引用任何字符\u0010。