Maison > Article > interface Web > javascript 防止高频调用的debounce函数
下面这个降频函数 debounce 能让你的代码变的高效:
<code class="language-javascript">// 返回一个函数,that, as long as it continues to be invoked, will not // be triggered. The function will be called after it stops being called for // N milliseconds. If `immediate` is passed, trigger the function on the // leading edge, instead of the trailing. function debounce(func, wait, immediate) { var timeout; return function() { var context = this, args = arguments; var later = function() { timeout = null; if (!immediate) func.apply(context, args); }; var callNow = immediate && !timeout; clearTimeout(timeout); timeout = setTimeout(later, wait); if (callNow) func.apply(context, args); }; }; // Usage var myEfficientFn = debounce(function() { // All the taxing stuff you do }, 250); window.addEventListener('resize', myEfficientFn);</code>
debounce
函数在给定的时间间隔内只允许你提供的回调函数执行一次,以此降低它的执行频率。当遇到高频触发的事件时,这样的限制显得尤为重要。