// Use for loop Judge whether there are duplicate names 
var len=$("li").length;// Get all the li The number of
for(var i=0; i<len; i++){
oldname_wenjiaming=$("li:eq("+i+") #wenjianming").val(); // Loop to get each li Below #wenjianming Value
if(checkname==oldname_wenjiaming){
alert(" Duplicate file name !");
return false; }
}

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