如何快速将字符串false转换为布尔类型

JSON.parse('false')

Object对象默认对key执行toString()

const a = {}
const b = { key: 'b' }
const c = { key: 'c' }
const d = [1,3,5,7]
// Object.prototype.toString().call(b) =>  '[object Object]'
a[b] = 123 // a['[object Object]'] = 123
a[c] = 456
// [1,3,5,7].toString() => 1,3,5,7
a[d] = 789 // a['1,3,5,7'] = 789
// a => { '[object Object]': 456, '1,3,5,7': 789 }

js写一个链式调用的函数

// Print().Print()() => bbbb
// Print()().Print() => aaa
function Print() {
    // typeof print => function
    // function是Object类型,可以对它增加属性 => print.Print = function() {}
    const print = function() {
        return {
            Print:function() {
                console.log('aaa')
            }
        }
    }
    print.Print = function() {
        return function() {
            console.log('bbbb')
        }
    }
    return print
}