var GetKeywords = {str: "",limit: 11,keywords:[],init : function(){var box = this._("article"),_this = this;//获取已经存在的关键词this.getAllKeyWord();//让rmKeyWord函数全局化window.rmkeyWord = this.rmkeyWord;//取词事件box.onmouseup = function(evt){var evt = evt || window.event,target = evt.target || evt.srcElement;//如果鼠标是在button上弹起，则忽略if(target.id == "btn") return;GetKeywords.str = _this.getSelectionText();if(_this.str.length == 0) return;if(_this._("btn")) {_this.removeBtn();if(GetKeywords.str == "") return;_this.createBtn(evt);return;}_this.createBtn(evt);}},//工具函数_: function(obj){return document.getElementById(obj);},//获取选中文本getSelectionText: function(){if(window.getSelection) {return window.getSelection().toString();} else if(document.selection && document.selection.createRange) {return document.selection.createRange().text;}return '';},//创建按钮createBtn: function(evt){var button = document.createElement("div"),evt = evt || window.event,x = evt.pageX || evt.x,y = evt.pageY || evt.y,i, j, len,cssList = "",_this = this,csses = {"height" : "30px","line-height" : "30px","position": "absolute","top": y + 10 + "px","left": x + 10 + "px","cursor": "pointer","border": "1px solid #000","background": "#EEE","padding": "2px 8px","border-radius": "3px"};for(i in csses){if(csses.hasOwnProperty(i)){cssList += i + ":" + csses[i] + ";";}}button.style.cssText = cssList;button.innerHTML = "添加到关键词列表";button.setAttribute("id", "btn");this._("article").appendChild(button);button.onclick = function(){if(_this.str.length > _this.limit){alert("关键词长度最长为11，可以通过设置GetKeywords.limit来控制长度。");_this.removeBtn();return;}for(j = 0, len = GetKeywords.keywords.length; j < len; j++){if(GetKeywords.keywords[j] == _this.str){alert("已经存在该关键词了~");_this.removeBtn();return;}continue;}           _this.keywords.push(_this.str);_this.setRed(_this.str);_this.addTo();_this.removeBtn();};},//删除按钮removeBtn: function(){var btn = this._("btn");btn.parentNode.removeChild(btn);},//加入到关键词里列表addTo: function(){var word = this._("wordList");word.innerHTML += "<span><font>" + this.str + "</font><a href='#' οnclick='rmkeyWord(this);'></a></span>";},//关键词标红setRed: function(str){var content = this._("article"),temp = '(' + str + ')';reg = new RegExp(temp,'g');content.innerHTML = content.innerHTML.replace(reg, "<span style='color:red;'>$1</span>");},//删除标红rmRed: function(str){var content = this._("article"),temp = "(<span[^<]*" + str + "</span>)";reg = new RegExp(temp,'gi');content.innerHTML = content.innerHTML.replace(reg, str);},//获取已经存在的关键词（也可以用来获取所有关键词）getAllKeyWord: function (){var spans = this._("wordList").getElementsByTagName("span"),key = [], i = 0, len;for(len = spans.length; i < len; i++){var font = spans[i].getElementsByTagName("font")[0];var temp = font.innerText || font.textContent;this.setRed(temp);key.push(temp);}this.keywords = key;},//删除关键词rmkeyWord: function (obj){var target = obj.parentNode,word = obj.previousSibling.innerHTML,i = 0, len;GetKeywords.rmRed(word);for(len = GetKeywords.keywords.length; i < len; i++){if(GetKeywords.keywords[i] == word){GetKeywords.keywords.splice(i,i);}continue;}target.parentNode.removeChild(target);return;}
}GetKeywords.init();

getSelectionText: function(){if(window.getSelection) {return window.getSelection().toString();} else if(document.selection && document.selection.createRange) {return document.selection.createRange().text;}return '';
}

createBtn: function(evt){var button = document.createElement("div"),
        //...csses = {"height" : "30px","line-height" : "30px","position": "absolute","top": y + 10 + "px","left": x + 10 + "px","cursor": "pointer","border": "1px solid #000","background": "#EEE","padding": "2px 8px","border-radius": "3px"};for(i in csses){if(csses.hasOwnProperty(i)){cssList += i + ":" + csses[i] + ";";}}button.style.cssText = cssList;button.innerHTML = "添加到关键词列表";button.setAttribute("id", "btn");
　　//...
}

obj.style[i] = csses[i];

//关键词标红
setRed: function(str){var content = this._("article"),temp = '(' + str + ')';reg = new RegExp(temp,'g');content.innerHTML = content.innerHTML.replace(reg, "<span style='color:red;'>$1</span>");
}

//删除标红
rmRed: function(str){var content = this._("article"),temp = "(<span[^<]*" + str + "</span>)";reg = new RegExp(temp,'gi');content.innerHTML = content.innerHTML.replace(reg, str);
}

//获取已经存在的关键词（也可以用来获取所有关键词）
getAllKeyWord: function (){//...
},//删除关键词
rmkeyWord: function (obj){//...GetKeywords.rmRed(word);for(len = GetKeywords.keywords.length; i < len; i++){if(GetKeywords.keywords[i] == word){GetKeywords.keywords.splice(i,i);}continue;}
    //...
}

GetKeywords.init();