一行JS实现功能代码

2021-07-14 10:05:10

1. 获取一个随机的布尔值

const random = function(){
   return Math.random() >= 0.5
}
console.log(random());

2. 检查日期是不是工作日

const isWeek = function(date){
   return date.getDay() % 6 !== 0;
}
console.log(isWeek(new Date(2021,04,04)));

3. 反转字符串

const reverseStr = function(str){
   return str.split(‘‘).reverse().join(‘‘)
}
console.log(reverseStr(‘hello‘));

4. 检查当前tab页是否在前台

const isBroTabInView = () => document.hidden;
console.log(isBroTabInView())

5. 检查数字是否为奇数

const isEven = num => num % 2 === 0;
console.log(isEven(3))

6. 从日期中获取时间

const timeFormDate = date => date.toTimeString().slice(0,8);
console.log(timeFormDate(new Date())) // 当前的时间

7. 检查元素当前是否为聚焦状态

const isFocus = function(ele){
    return ele === document.activeElement;
}
isFocus(anyElement)

8. 检查当前用户是不是苹果设备

const isAppleDevice = /Mac|iPod|iPhone|iPad/.test(navigator.platform);
console.log(isAppleDevice)

9. 滚动到页面顶部

const goToTop = () => window.scrollTo(0,0);

10. 获取所有参数平均数

const average = (...args) => args.reduce((a,b)=>a+b) / args.length;
average(1,2,3,4)

11. 转换华氏度/摄氏度

const celsiusToFahrenheit = (celsius) => celsius * 9/5 + 32;
const fahrenheitToCelsius = (fahrenheit) => (fahrenheit - 32) * 5/9;

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