js插入字符到textarea的效果代碼

2019-11-21 01:46:02

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供稿：網(wǎng)友

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>m.survivalescaperooms.com js插入字符到textarea腳 本之家</title> <script language="javascript" type="text/javascript"> function grin(tag) {         var myField;         myField = document.getElementById('content');         if (document.selection) {                 myField.focus();                 sel = document.selection.createRange();                 sel.text = tag;                 myField.focus();         }         else if (myField.selectionStart || myField.selectionStart == '0') {                 var startPos = myField.selectionStart;                 var endPos = myField.selectionEnd;                 var cursorPos = endPos;                 myField.value = myField.value.substring(0, startPos)                                           + tag                                           + myField.value.substring(endPos, myField.value.length);                 cursorPos += tag.length;                 myField.focus();                 myField.selectionStart = cursorPos;                 myField.selectionEnd = cursorPos;         }         else {                 myField.value += tag;                 myField.focus();         } } </script> </head> <body> <button onclick="grin('A')">A</button> <textarea id="content"></textarea> </body> </html>

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