javascript 節流案例

        1.使用setTimeout實現    
        var input=document.querySelector("input");
        input.addEventListener("input",inputHandler);
        var ids;

        function inputHandler(e){
            if(ids) return;
            ids=setTimeout(function(){
                clearTimeout(ids);
                ids=0;
                doTextValue(input.value)
            },500);
        }

        function doTextValue(txt){
            console.log(txt);
        }
        2.使用時間戳實現
        export const throttle = (function () {
            var currentTime = 0;
            var timer = null;
            return function (callback, timeout) {
                timeout = timeout || 300;
                clearTimeout(timer);
                var lastTime = new Date().getTime();
                if (lastTime - currentTime > timeout) {
                    callback();
                    currentTime = lastTime;
          
                } else {
                    timer = setTimeout(() => {
                        callback();
                    }, timeout)
                }
            }
        })()