TypeError: ' Stepup ' called on a object that does not implement interface htmlinputelement.

1. Error description

2. Cause of Error

$.ajax ({      type: "Post",      URL: "/user/queryuserinfo",      dataType: "JSON",      data:{          "userId": $ ("# UserID "). Val (),          " num ": num,          " type ": $ (" #type "). Val ()      },      success:function (resp) {      }});

error occurred in query request because NUM is undefined

3. Solutions

var num = 0;if ($ ("#type"). val () = = "1") {     num = $ ("#num"). Val (); else{     num = 0;} $.ajax ({      type: "Post",      URL: "/user/queryuserinfo",      dataType: "JSON",      data:{          "userId": $ ("# UserID "). Val (),          " num ": num,          " type ": $ (" #type "). Val ()      },      success:function (resp) {      }});

Initialize and assign a value before using NUM to prevent an uninitialized result of an error

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TypeError: ' Stepup ' called on a object that does not implement interface htmlinputelement.