function generate() {
var tab = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9'];
var text = [];
for (var i = 0; i < 10; i++) {
x = Math.random()*tab.length;
z = Math.floor(x)
text.push(tab[z]);
}
console.log(text);
document.getElementById('input1').value = text.join('');
}
