function insertAtCaret(areaElement,textFeildValue){ var textObj = areaElement; // 兼容不支持 selectionStart 浏览器 if(document.all && textObj.createTextRange && textObj.caretPos){ var caretPos=textObj.caretPos; caretPos.text = caretPos.text.charAt(caretPos.text.length-1) == '' ? textFeildValue+'' : textFeildValue; } else if(textObj.setSelectionRange){ var rangeStart=textObj.selectionStart; var rangeEnd=textObj.selectionEnd; var tempStr1=textObj.value.substring(0,rangeStart); var tempStr2=textObj.value.substring(rangeEnd); textObj.value=tempStr1+textFeildValue+tempStr2; textObj.focus(); var len=textFeildValue.length; textObj.setSelectionRange(rangeStart+len,rangeStart+len); // 移动光标到添加内容之后 } else { textObj.value+=textFeildValue; } return true; } function insertAtCaret(areaElement,textFeildValu
阅读背景：
JS在文本框光标处插入文本
来源：互联网
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