jquery Loop Statement If-else If-else

jquery Loop Statement If-else If-else
Callbackfun () function, beginning is written if-if-else. The result is that the first if there is no match, it will be judged again,

If the second if is matched, the statement in the second if is executed, and the statement in else is executed if there is no match to the second if.

function Checkkey () {
var url = ' ${ctx}/pos/pos!validateimei.do ';
var params = {imei:$ (' #imei '). attr (' value ')};
/**$ (' #warn '). HTML ("The IMEI number does not exist, please re-enter it.") ");*/
Jquery.post (URL, params, callbackfun);
}

function Callbackfun (data) {
if (data== ' yes ') {
/**$ (' #warn '). HTML (data);
$ (' #warn '). HTML ("the IMEI number exists.") ");
}else if (data== ' no ') {
/**$ (' #warn '). HTML (data);
$ (' #warn '). HTML ("The IMEI does not exist, please re-enter it.") ");
}else{
$ (' #warn '). HTML ("Unknown error.") ");
}
/**$ (' #warn '). HTML (data);
}