daily/interview/javascript.md at b4d0f36bcefbff985e4dba436a07f5c8e4fed17a

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2020-06-19 11:47:50 +08:00

var x = 0, y = 0;
x
++
y
console.log(x, y);

function isArray() {
  return
  true;
}
isArray();

var y,
  x = 1;
y = x+++x;

var x = "1", y;
switch (x) {
  case 1:
    y = 1;
    break;
  case 2:
    y = 2;
    break;
  default:
    y = 0;
}
console.log(y);

var numberObj = {
  valueOf: function() {
    return {};
  },
  toString: function() {
    return "10";
  }
};
Number(numberObj);

var a = {},
  b = { name: "ping" },
  c = { name: "wen" };
a[b] = 10;
a[c] = 20;
console.log(a[b]);

var obj1 = {
  names: []
};
var obj2 = obj1.names;
obj2.push("strick");
console.log(obj1.names);

var str = "pw1",
  pattern1 = /\d/,
  pattern2 = /\d/g;
pattern1.test(str);
pattern2.test(str);
pattern2.test(str);

var arr1 = "ping".split(""),
  arr2 = arr1.reverse(),
  arr3 = "pw".split("");
arr2.push(arr3);

var arr = [4, 1, 5, 2, 3];
arr.sort(function(a, b) {
  return a > b;
});

(function() {
  var a = b = 5;
})();
console.log(b);

var toString = Object.prototype.toString;
toString.call(null);
toString.call(undefined);

console.log(1);
setTimeout(function() {
  console.log(2);
}, 0);
console.log(3);

for (var i = 0; i < 3; i++) {
  setTimeout(function() {
    console.log(i);
  }, 0);
}