var urlList=['1.php','2.php','3.php','4.php'];
function ajax(index,arr){
    if(index<arr.length){
        var value=arr[index];
$.ajax({
            url:value,
type:'GET',
success:function (data) {
                console.log(data);
ajax(index+1,arr);
}
        });
}
}
$("#btn4").click(urlList,function 
 
(e) {
    ajax(0,e.data);
})

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