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for(i=0; i<len; i++){
  if(zdname != ""){
  zdname += "#" + trNode.children.item(i).getAttribute("busPath");
 }else{
  zdname = trNode.children.item(i).getAttribute("busPath");
 }
}
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Ê×ÏȵÚÒ»¸öStringBuffer¶ÔÏó
function StringBuffer() {   
     var _parts = new Array(); 
}   
  
StringBuffer.prototype.append = function (text) {   
    if ((text == null) || (typeof(text) == 'undefined')) {
        return this;
    }
    if ((typeof(text) == 'string') && (text.length == 0)) {
        return this;
    }
   
    _parts.push(text);
    return this;  
}   
  
StringBuffer.prototype.toString = function(delimiter) {   
    return _parts.join(delimiter || '');   
}
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var buffer = new StringBuffer();
for(i=0; i<len; i++){
  buffer.append(trNode.children.item(i).getAttribute("busPath"));
}
zdname = buffer.toString("#");
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