Javascript Array toSource 方法

arrayObject.toSource();

var Arr = [11, 2, 73, 41, 53, 6, 38, 9, 40],
    s = Arr.toSource();

console.log( s );
console.log( typeof s );

>>>
[11, 2, 73, 41, 53, 6, 38, 9, 40]
string