Front-end development - js common tool functions (utilities)

1. Time

function getCurTime() {
    var date = new Date();
    return date.toLocaleTimeString();
}

• date.toLocaleTimeString(): am or afternoon, what time and what time;
• date.toLocaleDateString(): date, month and day;

2. Random

• Interval:

  function randInt(low, high) {
      return Math.floor(Math.random()*(high-low) + low)
  }

3. setInterval 与 setTimeout

• Execute every 1 second:

  setInterval ( function () {
      console.log('hello world')
  }, 1000)
  setInterval ( function () {
      console.log(Math.floor(Math.random()))
  }, 1000)

  How to close the timing cycle execution, you need to save the id identification code in advance:

  var id = setInterval ( function () {
      var num = Math.floor(Math.random() * 1024)
      console.log(num)
  }, 3000);
  ....
  clearInterval(id)

• setTimeout() : Run the function regularly, it will only run once when the specified time is up;