javascript獲取選中的文本的方法代碼

2019-11-20 21:49:02

字體：大中小

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>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
body { font-size:12px; }
#show { background-color:#CCFF99; }
</style>
</head>
<body>
<textarea id="content" cols="30" rows="10">
河中魚類離奇死亡，下游居民頻染怪病，沿岸植物不斷變異，是殘留農(nóng)藥？還是生化攻擊？敬請(qǐng)關(guān)注今晚CCTV-10《科學(xué)探索》，即將播出的專題節(jié)目：《神秘的河邊洗腳人--中國(guó)男足》
</textarea>

<button id="btn">獲取選中值</button>
<div id="show"></div>
<script>
    String.prototype.trim = function() {
         return this.replace(/^/s+|/s+$/g, "");
     }
/* 方法一 FF下有點(diǎn)問題 */
     function getSelectText() {
        try{
            // IE: document.selection.createRange() W3C:window.getSelection()
            var selectText = (document.selection && document.selection.createRange )? document.selection.createRange().text : window.getSelection().toString();
            if(selectText != null && selectText.trim() != ""){
               return selectText;
            }
        }catch(err){}
     }
/* 方法二 */
function getSelectText2(id) {
  var t = document.getElementById(id);
  if(window.getSelection) {
   if(t.selectionStart != undefined && t.selectionEnd != undefined) {
    return t.value.substring(t.selectionStart, t.selectionEnd);
   } else {
    return "";
   }
  } else {
   return document.selection.createRange().text;
  }
}
document.getElementById('btn').onclick = function() {
   document.getElementById('show').innerHTML = getSelectText2('content');
}
</script>
</body>
</html>