JavaScript итерация над объектом
var obj = { first: "John", last: "Doe" };
Object.keys(obj).forEach(function(key) {
console.log(key, obj[key]);
});
Bald Eagle
var obj = { first: "John", last: "Doe" };
Object.keys(obj).forEach(function(key) {
console.log(key, obj[key]);
});const obj = { a: 1, b: 2 };
Object.keys(obj).forEach(key => {
console.log("key: ", key);
console.log("Value: ", obj[key]);
} );for (var property in object) {
if (object.hasOwnProperty(property)) {
// Do things here
}
}
var p = {
"p1": "value1",
"p2": "value2",
"p3": "value3"
};
// for-in
for (var key in p) {
if (p.hasOwnProperty(key)) {
console.log(key + " -> " + p[key]);
}
}
// for-of with Object.keys()
for (var key of Object.keys(p)) {
console.log(key + " -> " + p[key])
}
// Object.entries()
for (let [key, value] of Object.entries(p)) {
console.log(`${key}: ${value}`);
}var person={
first_name:"johnny",
last_name: "johnson",
phone:"703-3424-1111"
};
for (var property in person) {
console.log(property,":",person[property]);
}const rgb = [255, 0, 0];
// Randomly change to showcase updates
setInterval(setContrast, 1000);
function setContrast() {
// Randomly update colours
rgb[0] = Math.round(Math.random() * 255);
rgb[1] = Math.round(Math.random() * 255);
rgb[2] = Math.round(Math.random() * 255);
// http://www.w3.org/TR/AERT#color-contrast
const brightness = Math.round(((parseInt(rgb[0]) * 299) +
(parseInt(rgb[1]) * 587) +
(parseInt(rgb[2]) * 114)) / 1000);
const textColour = (brightness > 125) ? 'black' : 'white';
const backgroundColour = 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')';
$('#bg').css('color', textColour);
$('#bg').css('background-color', backgroundColour);
}