2017 JavaScript高考全国卷 参考答案与解析

[ ] + [ ] + 'foo'.split('');

new Array(5).toString();

(true + false) > 2 + true;

function a(x) {
    return x * 2;
}
var a;
alert(a);

function a(x) {
    return x * 2;
}

var func = function h5course() {
    alert(typeof h5course);
} 
func();
alert(typeof h5course);

var x = 1;
if (function f(){}) {
    x += typeof f;
}
alert(x);

function fun(n, o) {
  console.log(o);
  return {
    fun: function(m){
      return fun(m,n);
    }
  };
}
var a = fun(0);a.fun(1);a.fun(2);a.fun(3);
var b = fun(0).fun(1).fun(2).fun(3);
var c = fun(0).fun(1);
c.fun(2);
c.fun(3);

var x = 1;
var y = 2;
function show() {
    var x = 3;
    return {
        x: x,
        fun: function(a, b) {
            x = a + b;
        }
    }
}
var obj = show();
obj.fun(x, y);
console.log(obj.x);
console.log(x);

var a = 0,
    b = 0; 
function A(a){ 
    A = function(b){ 
        alert(a + b++); 
    } 
    alert(a++); 
}
A(1);
A(2);

var arr = [];
arr[0]  = 'a';
arr[1]  = 'b';
arr.foo = 'c';
alert(arr.length);
arr.length += arr.foo.length;
alert(arr.length);