Boolean() 函数
Boolean（布尔）对象用于将非布尔值转换为布尔值。
- 0和nan，false
- 空串，false
- null和undefined false
- 空数组，空对象，空格字符串，都是true
console.log(Boolean(0)); // false
console.log(Boolean(NaN)); // false
console.log(Boolean(12)); // true
console.log(Boolean('')); // false
console.log(Boolean(' ')); // true
console.log(Boolean('小白')); // true
console.log(Boolean(null)); // false
console.log(Boolean(undefined)); // false
console.log(Boolean([])); //true
console.log(Boolean([1, 2, 3])); //true
console.log(Boolean({})); //true
console.log(Boolean({name:'why'})); //true
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