SOURCE

var a = function() {
    return 1111;
}
if (a() == true) {
    console.log('aaaaaa');
}

var str = 'w';
if (str.match(/[aeiou]/gi) === null) {
    console.log('找不到');
}

var c;
console.log(c);

var d = {
    name : '李海波',
    age : c,
};
console.log(d.age);

var e = 1;
e = 1.0;

var f = function() {
    return '15';
}
console.log(Number(f()));
if (Number(f()) != NaN && f() > 0 && f() < Number.MAX_SAFE_INTEGER) {
    console.log('有数据');
}

var a1 = 9223372036854775808;
console.log(Number.MAX_SAFE_INTEGER);
console.log(a1);

var aa = 0xF;
console.log(aa);

var ab = 0B1111;
console.log(ab)

var ac = 0O10;
console.log(ac);