Analysis of anti-shake and throttling principles in JavaScript

Anti-shake and throttling are commonly used performance optimization techniques in JavaScript development. They are used to limit events or functions that are triggered frequently to reduce unnecessary calculations and network requests and improve the response speed and performance of the page. This article will analyze the principles of anti-shake and throttling in detail and provide corresponding source code examples.

1. Analysis of anti-shake (Debounce) principle

The principle of anti-shake is that within a specified time interval, if an event continues to be triggered, the timer will be restarted. The corresponding operation will only be performed if the event is not triggered again within the specified time interval after the event is triggered. Anti-shake is often used to handle frequently triggered operations such as input box input events and window resizing.

Here is a sample code using anti-shake technology:

function debounce(func, delay) {
  let timerId;
  
  return function() {
    const context = this;
    const args = arguments;
    
    clearTimeout(timerId);
    
    timerId = setTimeout(function() {
      func.apply(context, args);
    }, delay);
  };
}

// 使用防抖技术处理输入框输入事件
const input = document.querySelector('#input');
input.addEventListener('input', debounce(function() {
  // 处理输入事件的逻辑
}, 300));

In the above code, debouncethe function accepts a function parameter funcand a delay time parameter delay. In the returned function, each time an event is triggered, the previous timer is cleared and the timer is reset, executing the passed-in function after the delay time func.