JavaScript 这几个“神（qi）奇 (pa)“设计也是醉了......

const numbers = [1, 2, 3, 4];
for (var i = 0; i < numbers.length; i++);{ 
    console.log(`The number is ${numbers[i]}`)    }

// The number is undefined

const numbers = [1, 2, 3, 4];
for (var i = 0; i < numbers.length; i++){ 
    console.log(`The number is ${numbers[i]}`)    }

// The number is 1// The number is 2// The number is 3// The number is 4

for (var i = 0; i < numbers.length; i++); <==== 就是这个分号

numbers();
var numbers = function () {  console.log("Number one");}
numbers();
function numbers() {  console.log("Number two");}
numbers();

// Number two// Number one// Number one

console.log(a);
var a;
console.log(b);

// undefined
// Uncaught ReferenceError: b is not defined

let counter = function() {  
    let k = 0;  
    return () => k++;
}();
console.log(counter());console.log(counter());console.log(counter());console.log(counter());

// 0
// 1
// 2
// 3

let count = 0;
(function immediate() {  
    if (count === 0) {    
        let count = 1;    
        console.log(count); // What is logged?  
    }  
    console.log(count); // What is logged?
})();

// 1
// 0

var length = 4;
function callback() {  
    console.log(this.length);
}
const object = {  
    length: 5, 
    method() {   
        arguments[0]();  
    }};
object.method(callback, 1, 2);

// 3

const fruits = [‘mango’, ‘apple’];
fruits.length = 0;
console.log(fruits[0]);

// undefined