qrcode.js

//a qrcode bookmarklet(二维码小书签)

//javascript:(function(d){var b=d.createElement("textarea"),c,f=!!d.all,a,e="http://qrcode.kaywa.com/img.php?s=5&d=%s";(c=d.getElementById("_qrcode__"))?(b=c,a=b.style,a.display=""):(a=b.style,b.id="_qrcode__",d.body[f?"attachEvent":"addEventListener"]((f?"on":"")+"click",function(){a.display="none"},!0),a.zIndex=9999,a.position="fixed",a.top=0,a.left=0,a.width="100%",a.height="100%",d.body.appendChild(b));c=function(){var a,b=d.selection,c=d.activeElement,e=top.getSelection,f=c&&c.selectionEnd;f?a=c.value.substring(c.selectionStart, f):e&&(a=e()+"");b&&(a=b.createRange().text);return a=a||location.href}();b.title=c;e=e.replace("%s",encodeURIComponent(c));a.color='#fff';a.background="rgba(0, 0, 0, 0.3) url("+e+") no-repeat center";b.select()})(document);

//original code
(function(doc){
  var qrcode = doc.createElement('textarea'), tmp,
    ie = !!doc.all, style, txt,
    qrimage = 'http://qrcode.kaywa.com/img.php?s=5&d=%s',
    id = '_qrcode__';
    
  //获取选中文字
  var getSelectext = function(){
    var text,
      IEselection = doc.selection,
      activeEle = doc.activeElement,
      getSelection = top.getSelection,
      selectionEnd = activeEle && activeEle.selectionEnd;
    selectionEnd ? 
      (text = activeEle.value.substring(activeEle.selectionStart, selectionEnd)) : 
      getSelection && (text = getSelection() + '');
    IEselection && (text = IEselection.createRange().text);
    text = text || location.href;
    return text;
  };
  
  if(tmp = doc.getElementById(id)){
    qrcode = tmp;
    style = qrcode.style;
    style.display = '';
  }else{
    style = qrcode.style;
    qrcode.id = id;
    doc.body[ie ? 'attachEvent' : 'addEventListener']((ie ? 'on' : '') + 'click', function(){
      style.display = 'none';
    }, true);
    style.zIndex = 9999;
    style.position = 'fixed';
    style.top = 0;
    style.left = 0;
    style.width = '100%';
    style.height = '100%';
    doc.body.appendChild(qrcode);
  }
  txt = getSelectext();
  qrcode.title = txt;
  qrimage = qrimage.replace('%s',  encodeURIComponent(txt));
  style.color = '#fff';
  style.background = 'rgba(0, 0, 0, 0.3) url(' + qrimage + ') no-repeat center';
  qrcode.select();
})(document)