textarea在光标后追加内容，并将换行符替换成br标签
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="jquery-3.3.1.min.js"></script>
<script type="text/javascript">
//在光标处插入字符串
// myField 文本框对象
// myValue 要插入的值
function insertAtCursor(myField, myValue)
{
//IE support
if (document.selection)
{
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
sel.select();
}
//MOZILLA/NETSCAPE support
else if (myField.selectionStart || myField.selectionStart == '0')
{
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
// save scrollTop before insert
var restoreTop = myField.scrollTop;
myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
if (restoreTop > 0)
{
// restore previous scrollTop
myField.scrollTop = restoreTop;
}
myField.focus();
myField.selectionStart = startPos + myValue.length;
myField.selectionEnd = startPos + myValue.length;
} else {
myField.value += myValue;
myField.focus();
}
}
function replace(strValue){
return strValue.replace(/\r\n/g, '<br/>').replace(/\n/g, '<br/>').replace(/\s/g, ' ');
}
$(function(){
$("#btn").click(function(){
insertAtCursor($("#area").get(0),$("input[name=content]").val());
});
$("#get").click(function(){
alert(replace($("#area").val()));
});
});
</script>
</head>
<body>
<button id="btn">在光标后追加</button>
要追加的内容：<input name="content">
<textarea id="area" style="width: 400px;height: 300px;"></textarea>
<button id="get">获取带换行符的textarea内容</button>
</body>
</html>
