Just enter the code and use js to control the insertion at the cursor position.
It is used when implementing the insertion of expressions.
The code copy is as follows:
<span style="font-size:18px;"><html>
<head>
<script type='text/javascript'>
function test(str){
var tc = document.getElementById("mytextarea");
var tclen = tc.value.length;
tc.focus();
if(typeof document.selection != "undefined")
{
document.selection.createRange().text = str;
}
else
{
tc.value = tc.value.substr(0,tc.selectionStart)+str+tc.value.substring(tc.selectionStart,tclen);
}
}
</script>
</head>
<body>
<textarea rows=5 name=s1 cols=27 id="mytextarea">Purpose: Insert text at the cursor stop in textarea by clicking on the button button on the page</textarea>
<input type=button onclick="test('This is the text that needs to be added')" />
</body>
</html>
</span>