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var a = [[1, [5, 6, 8]], 3, [3,4]];
var b = [];
function clone(s, t) {
for(var i = 0, len = s.length; i < len; i++) {
if(typeof s[i] == 'object') {
t[i] = [];
clone(s[i], t[i]);
} else {
t[i] = s[i];
}
}
}
clone(a, b);
a[0][0] = 10;
console.log(a);
console.log(b);