private boolean isFunctionOver(){
		if(this.token.length()>0){
			String tmp=this.token;
			int leftBracketCount=0;
			int rightBracketCount=0;
			char T[]=tmp.toCharArray();
			for(int i=0;i<T.length;++i){
				if(T[i]=='('){
					leftBracketCount++;
				}else if(T[i]==')'){
					rightBracketCount++;
				}
			}
			if(leftBracketCount>0||rightBracketCount>0){
				if(leftBracketCount==rightBracketCount){
					return true;
				}
			}
		}
		return false;
	}