the returned data is not in the correct format
jsonp is the callback function callbackName ({name: "123"}) this kind of data you can look at the response
you have written the wrong code. It is not closed. If it is a request error, please see whether network has requested
. 
Please learn cross-domain fundamentals. The basics are the most important.
jsonp: "callback" and jsonpCallback: "message". Do you know what they do? no, these two sentences need to be written in the background.
for example,
System.out.print ('message (' + data+')') written in the background in Java language;
System.out.print ('callback (' + data+')');
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I m going to assign the default value of 1 to the value of the drop-down box and bind this variable; <select v-model= selectValue >< select> but just let data(){ return{ selectValue:1 } } this type of writing is not readable, so I ...