A js code encountered a bug caused by an implicit global variable in the middle, Because of the amount of code, the problem was found through the javascript debugger of the Google browser. I said I couldn’t install fiefox on my computer in any case, and I tried many times since last year, all of which failed. But the debugging of Google is also useful. The simplified code is as follows:

$(function(){
var pageNo = 2;//This parameter is variable
var pageSize = 10;
test();
paginate(pageNo,pageSize);//Because the test() method overrides the pageNo, the pageNo is always equal to 1
});
function test(){
pageNo = 1;//Global variable, overwriting the previous pageNo, is equivalent to writing var pageNo = 1 at the top of js
//Var pageNo = 1; It is ok
//do,,,
}
function paginate(pageNo,pageSize){
window.location.href = "user_list.action?pageNo="+pageNo+"&pageSize="+pageSize;
}

In js, it is recommended that all variables be declared with var, and all variables can be written to the top, because js has no block-level scope.