TypeError: 'stepUp' called on an object that does not implement interface HTMLInputElement in jquery

$.post(requestUrl, {"action":"register","username":username,"active": "1",  
"userpassword": userpassword, "role": "8", "mobile": phone, "email": email, "yanzheng":yanzheng,"isCreate":true},

FIX:
You are sending the object element user_password. You should post the value of object in post method user_password.value($(“#user_password”).val()).
只因为写错了一个变量，擦擦，，

passwd = $("#user_password").val();
r_passwd =  $("#r_password").val();

$.post(requestUrl, {"action":"register","username":username,"active": "1",  
"user_password": password, "role": "8", "mobile": phone, "email": email, "yanzheng":yanzheng,"isCreate":true},

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