我确实需要换行符，但即使使用wrap =“hard”，定义列，该值仍然是单行。
<!DOCTYPE html>
<html>
<body>
<h1>The textarea wrap attribute</h1>
<textarea id="usrtxt" rows="2" cols="5" name="usrtxt" wrap="hard" style="overflow-wrap: break-word; width: 100px;">
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</textarea>
<!-- A div to display the textarea content -->
<div id="textareaContent"></div>
<script>
// Function to display textarea content
function showTextareaContent() {
var textarea = document.getElementById('usrtxt');
var displayArea = document.getElementById('textareaContent');
displayArea.innerText = textarea.value;
}
// Event listener for the textarea input
document.getElementById('usrtxt').addEventListener('input', showTextareaContent);
// Initialize the display area with the current content of the textarea
showTextareaContent();
</script>
</body>
</html>wrap属性 - 关键部分是“用于表单提交”。
确实，文本区域的值不包含添加的
\n通过添加一个包裹textarea的form元素，你可以使用FormData来获取格式化的文本。
<!DOCTYPE html>
<html>
<body>
<h1>The textarea wrap attribute</h1>
<form>
<textarea name="usrtxt" id="usrtxt" rows="2" cols="5" name="usrtxt" wrap="hard" style="overflow-wrap: break-word; width: 100px;">
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</textarea>
</form>
<!-- A div to display the textarea content -->
<div id="textareaContent"></div>
<script>
// Function to display textarea content
function showTextareaContent() {
var textarea = document.getElementById('usrtxt');
let form = textarea.form;
let fd = new FormData(form);
let formatted = fd.get("usrtxt"); // this uses the "name" property of the textarea element
var displayArea = document.getElementById('textareaContent');
displayArea.innerText = formatted;
}
// Event listener for the textarea input
document.getElementById('usrtxt').addEventListener('input', showTextareaContent);
// Initialize the display area with the current content of the textarea
showTextareaContent();
</script>
</body>
</html>