JS的StringBuffer类的实现及使用

function StringBuffer() {  
    this.__strings__ = [];  
};  
StringBuffer.prototype.append = function(str) {  
    this.__strings__.push(str);  
};  
StringBuffer.prototype.toString = function() {  
    return this.__strings__.join('');  
};  

    function GnComCard(companymsg) {

                var buffer = new StringBuffer();//声明一个对象

                buffer.append('<li>');//追加字符串，下同

                buffer.append('<div class="com_photo"><a href="#" title="用户头像"><img class="userPhoto" src="');

                buffer.append(companymsg.userPhoto);

                buffer.append('"></img></a></div>');

                buffer.append('<div class="com_msg">');

                buffer.append('<div><a class="com_comname">'+ companymsg.companyMasterName+ '</a> <span class="com_time">'

                    + FormatDate(companymsg.crtime) + '</span></div>');  
            buffer.append('</div><div class="news">');  
            if (companymsg.newsId != null) {  
                buffer.append('<a href="'+companymsg.newsId+'" title="新闻动态" class="com_newsname">'+ companymsg.newsTitle + '</a>');  
            } else {  
                buffer.append('<a href="javascript:void(0)" class="com_newsname">'+ companymsg.newsTitle + '</a>');  
            }  
            if (companymsg.newsContent != null) {  
                buffer.append('<div class="com_sh"><span class="toggle">>>展开</span></div>');  
                buffer.append('<div class="com_newscontent">'+ companymsg.newsContent + '</div>');  
            }  
            buffer.append('</div>');  
            buffer.append('<div class="comment"><a href="javascript:void(0)" style="float:left" title="追踪公司"><span class="track"></span></a><input type="text"></input></div>');  
            buffer.append('</div></li>');  
            return buffer.toString();//拼接成一个字符串  
        }  </pre>