本文为大家讲解下Javascript selection的兼容性写法，感兴趣的朋友可以参考下

 代码如下: function getSelectedText() { //this function code is borrowed from: http://www.codetoad.com/javascript_get_selected_text.asp    var txt = "";  if (window.getSelection) {  txt = window.getSelection();  } else if (window.document.getSelection) {  txt = window.document.getSelection();  } else if (window.document.selection) {  txt = window.document.selection.createRange().text;  }  return txt;  }