函数防抖

/**
 * 函数防抖
 * @param {*} func 函数
 * @param {*} wait 延迟执行毫秒数
 * @param {*} immediate true 表立即执行，false 表非立即执行
 */ 
let debounce = (func,wait,immediate) => {
    let timeout;

    return function () {
        let context = this;
        let args = arguments;

        if (timeout) clearTimeout(timeout);
        if (immediate) {
            var callNow = !timeout;
            timeout = setTimeout(() => {
                timeout = null;
            }, wait)
            if (callNow) func.apply(context, args)
        }
        else {
            timeout = setTimeout(function(){
                func.apply(context, args)
            }, wait);
        }
    }
}


// 调用
$(".box").on(‘mousemove‘, throttle(debounce, 1000, true))