帮忙看一下这个js方法的意思以及意义何在

[xingbear]

前面一步一步的调用我已经给出了，各位高手帮忙看一下下面js里的最后的O_0方法，这样写是什么意思，有什么意义，谢谢各位了！~

var lockCount=0;

function _form_(type, id, messageId, _stack_,_push_, postData,_pop_, callback, timeout) {
	this.type = type;
	this.id = id;
	this.messageId = messageId;  
	this._stack_  = _stack_;
	this._push_ = _push_;
	this.postData = postData;
	this._pop_ = _pop_; 
	this.callback = callback;
	if(timeout==null) {
		this.timeout = 300000;
	} else {
		this.timeout = timeout;
	}
	this.cancel=false; // reserved for future
}

function c3_(type, data) {
	this.O_220_= null;
	this.type = type;
	this.data = data;
}

function postData2SRVNoFoward(_push_, postData , id, messageId,callback, timeout) {
	if(_fld_!=null) {	   	  
		var OOP_ =new _form_(0, id, messageId, null, _push_, postData, false, callback, timeout);	
		_lyd3_(OOP_);
	} else { 
		alert("cannot allocate xmlhttp");
	}  	    
}

function _lyd3_(OOP_) {
	var _fld__ = new c3_(0, OOP_);
    OOP__(_fld__);
}

function OOP__(_fld__) {
    var O_10 = lockCount++; 
    var pos = O_10%100 ;
    O_201[pos]= O_10;
	{
		_fld__.O_220_ = O_10;
	    _fld__s[O_10%100] = _fld__; 
		window.setTimeout("O_0("+O_10+")",5);    
	}
}

function O_0(O_220_) {
	if(O_201[O_220%100]== O_220_) {
		var _fld__ =  _fld__s[O_220_%100];  
		_fld__s[O_220_%100] = null;
		if(_fld__.type==0 ) {
			_m_._fldOO_(O_220_, _fld__.data);
		} else if(_fld__.type==1) {
			_m_.o_o__O_O_(O_220_);
		}
	} else {
		window.setTimeout("O_0("+O_220_+")",5);
	}
}

[tcmakebest]

这个语法很容易查到的吧，是定时器，要求在一段时间之后执行一个语句。

[xingbear]

定时器我当然知道了，可能没说清楚，是这一段：

if(O_201[O_220%100]== O_220_) {         var _fld__ =  _fld__s[O_220_%100];           _fld__s[O_220_%100] = null;         if(_fld__.type==0 ) {             _m_._fldOO_(O_220_, _fld__.data);         } else if(_fld__.type==1) {             _m_.o_o__O_O_(O_220_);         }     }

就是最后一个方法里的if语句的前半部分