js编程--对象深拷贝/函数防抖/函数节流

1. 对象深拷贝
   使用Object.assign(obj2,obj1)将obj1中

        function depCopy(target, source) {
            // 1.通过遍历拿到source中所有的属性
            for(let key in source){
                // 2.取出当前遍历到的属性对应的取值
                let sourceValue = source[key];
                // 3.判断当前的取值是否是引用数据类型
                if(sourceValue instanceof Object){
                    let subTarget = new sourceValue.constructor;
                    target[key] = subTarget;
                    depCopy(subTarget, sourceValue);
                }else{
                    target[key] = sourceValue;
                }
            }
        }

2. 函数防抖

    function debounce(fn, delay) { // fn = test
        let timerId = null;
        return function () {
            let self = this;
            let args = arguments;
            timerId && clearTimeout(timerId);
            timerId = setTimeout(function () {
                fn.apply(self, args);
            }, delay || 1000);
        }
    }

3. 函数节流

    function throttle(fn, delay) { // fn = test
        let timerId = null;
        let flag = true;
        return function () {
            if(!flag) return;
            flag = false;
            let self = this;
            let args = arguments;
            timerId && clearTimeout(timerId);
            timerId = setTimeout(function () {
                flag = true;
                fn.apply(self, args);
            }, delay || 1000);
        }
    }