fix YH-5533

@@ -39,6 +39,7 @@ $verifyCodeImg.on('touchstart', function() {
     var oldSrc = $verifyCodeImg.attr('src').split('=');
 
     $verifyCodeImg.attr('src', oldSrc[0] + '=' + Date.now());
+    $verifyCode.val('');
 });
 
 $btnNext.on('touchstart', function() {

@@ -73,6 +73,7 @@ page = {
 
     refreshCapatch: function() {
         $captchaPNG.attr('src', '/passport/sms_login/captcha.png?t=' + Date.now());
+        $captcha.val('');
     },
 
     // 提交按钮