本文实例讲述了JavaScript记录光标在编辑器中位置的实现方法。分享给大家供大家参考，具体如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <script type="text/javascript"> function $(ele){return document.getElementById(ele)} //记录编辑器中的位置 var selection_start; var selection_end; function savePos(textBox){ var start=0; var end=0; if(typeof(textBox.selectionStart) == "number"){ // not ie //alert(typeof(textBox.selectionStart) ); start = textBox.selectionStart; end = textBox.selectionEnd; } else if(document.selection){ var range = document.selection.createRange(); if(range.parentElement().id == textBox.id){ var range_all = document.body.createTextRange(); range_all.moveToElementText(textBox); for (start=0; range_all.compareEndPoints("StartToStart", range) < 0; start++) range_all.moveStart('character', 1); for (var i = 0; i <= start; i ++){ if (textBox.value.charAt(i) == '/n') start++; } var range_all = document.body.createTextRange(); range_all.moveToElementText(textBox); for (end = 0; range_all.compareEndPoints('StartToEnd', range) < 0; end ++) range_all.moveStart('character', 1); for (var i = 0; i <= end; i ++){ if (textBox.value.charAt(i) == '/n') end ++; } } } selection_start = start; selection_end = end; } </script> <form action="" id="test"> <textarea id="t" onfocus="savePos(this);$('log').value=selection_start" onkeydown="savePos(this);$('log').value=selection_start" onmousedown="savePos(this);$('log').value=selection_start" onmouseup="savePos(this);$('log').value=selection_start" > </textarea> <input type="text" id="log" /> </form> </body> </html>
希望本文所述对大家JavaScript程序设计有所帮助。
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