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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Console Tricks!</title>
</head>
<body>
<p onClick="makeGreen()">×BREAK×DOWN×</p>
<script>
const dogs = [{ name: 'Snickers', age: 2 }, { name: 'hugo', age: 8 }];
function makeGreen() {
const p = document.querySelector('p');
p.style.color = '#BADA55';
p.style.fontSize = '50px';
}
// Regular
console.log('Kanboo');
// Interpolated
console.log('Hello I am a %s !', 'Kanboo'); // 一個變數
console.log('Hello I am a %s , %s!', 'Kanboo' , '你好嗎?'); // 二個變數
// Styled
console.log('%c I am Kaing!!', 'font-size:30px;')
// warning!
console.warn('顯示可能會發生錯誤的訊息'); // 警告
// Error :|
console.error('顯示已發生錯誤訊息'); // 錯誤
// Info
console.info('資訊'); // 失效,沒有顯示「帶白色“i”的藍色圓圈」
// Testing
function greaterThan(a,b) {
console.assert(a > b, "錯誤:" + a + " 沒有比 " + b + " 大");
}
greaterThan(1,20); // 條件為false,會顯示 錯誤訊息
greaterThan(20,1); // 條件為true,不顯示log
// clearing
// console.clear();
// Viewing DOM Elements
// 比較取得 DOM元素後,用 log 和 dir 顯示的差異
const p = document.querySelector('p');
console.log(p);
console.dir(p);
// Grouping together
dogs.forEach(dog => {
console.groupCollapsed(`${dog.name}`); //Group-起頭
console.log(`This is ${dog.name}`);
console.log(`${dog.name} is ${dog.age} years old`);
console.log(`${dog.name} is ${dog.age * 7} dog years old`);
console.groupEnd(`${dog.name}`); //Group-結尾
});
// counting
console.count('汪汪');
console.count('喵喵');
console.count('汪汪');
console.count('喵喵');
console.count('汪汪');
console.count('喵喵');
console.count('喵喵');
console.count('喵喵');
// timing
console.time('fetching data(花費時間)');
fetch('https://api.github.com/users/wesbos')
.then(data => data.json())
.then(data => {
console.timeEnd('fetching data(花費時間)');
console.log(data);
});
// table
console.table(dogs);
</script>
</body>
</html>