Classic code transmission codes

<meta charset="utf-8" >
<input type="button" id="btn" value="免费获取验证码" />  
<script type="text/javascript">  
var wait=60;  
function time(o) {  
        if (wait == 0) {  
            o.removeAttribute("disabled");            
            o.value = " Get a free verification code " ;  
            wait = 60;  
        } else {  
            o.setAttribute("disabled", true);  
            o.value = " Resend ( "  + the wait +  " ) " ;  
            wait--;  
            setTimeout(function() {  
                time (o)  
            },  
            1000)  
        }  
    }  
document.getElementById("btn").onclick=function(){time(this);}  
</script>  

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