function sendCheckNumber(){
		//每次點選產生驗證碼
		var codeLength = 4;//驗證碼長度為4
        //設定隨機字元
        currentCheckNumber="";//初始化驗證碼字串
        var random = new Array(0,1,2,3,4,5,6,7,8,9,
        	'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');
        for(var i = 0; i < codeLength; i++){
           var index = Math.floor(Math.random()*36);//設定隨機數範圍
           currentCheckNumber += random[index];     //字串拼接 將每次隨機的字元 進行拼接
        }
		 $('#tip4').html("");         //刪除之前的驗證碼      
		 $('#tip4').html(currentCheckNumber);//一個div顯示驗證碼並更新
}