function change(){
var randomVal = Math.round(Math.random() * num);
var prizeName = alldata[randomVal];
//show.text(prizeName);
show.attr("src",prizeName);
}
Array.prototype.indexOf = function(val) {
for (var i = 0; i < this.length; i++) {
if (this[i] == val) return i;
}
return -1;
};
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