JavaScript实现网页文字选中后一键分享至新浪微博

var $sinaMiniBlogShare = function(eleShare, eleContainer) { 
  var eleTitle = document.getElementsByTagName("title")[0]; 
  eleContainer = eleContainer || document; 
  var funGetSelectTxt = function() { 
    var txt = ""; 
    if(document.selection) { 
      txt = document.selection.createRange().text;  // IE 
    } else { 
      txt = document.getSelection(); 
    } 
    return txt.toString(); 
  }; 
  eleContainer.onmouseup = function(e) { 
    e = e || window.event; 
    var txt = funGetSelectTxt(), sh = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0; 
    var left = (e.clientX - 40 < 0) ? e.clientX + 20 : e.clientX - 40, top = (e.clientY - 40 < 0) ? e.clientY + sh + 20 : e.clientY + sh - 40; 
    if (txt) { 
      eleShare.style.display = "inline"; 
      eleShare.style.left = left + "px"; 
      eleShare.style.top = top + "px"; 
    } else { 
      eleShare.style.display = "none"; 
    } 
  }; 
  eleShare.onclick = function() { 
    var txt = funGetSelectTxt(), title = (eleTitle && eleTitle.innerHTML)? eleTitle.innerHTML : "未命名页面"; 
    if (txt) { 
      window.open('http://v.t.sina.com.cn/share/share.php?title=' + txt + '→来自页面"' + title + '"的文字片段&url=' + window.location.href);   
    } 
  }; 
}; 

<img id="imgSinaShare" class="img_sina_share" title="将选中内容分享到新浪微博" src="http://simg.sinajs.cn/blog7style/images/common/share.gif" /> 

$sinaMiniBlogShare(document.getElementById("imgSinaShare"));