xxx.forEach is not a function（DOM集合--类数组对象转化为数组）

//将hdList用Array.from（）方法转换为数组，并用list变量接收
let list = Array.from(hdList);

//hdList转化为数组并用list变量接收
let list = Array.prototype.slice.call(hdList);
//添加点击事件
list.forEach((current,index) => {
	current.addEventListener('click',() => {
		animationFn(index);
	},false);
});

let list = [...hdList];//用[ ...elems ]方法转化为数组并用list接收
//添加点击事件
list.forEach((current,index) => {
	current.addEventListener('click',() => {
		animationFn(index);
	},false);
});

//直接对hdList集合进行循环或者map等
Array.prototype.forEach.call（hdList,function(){
//...
}）
Array.prototype.map.call（hdList,function(){
//...
}）

//添加点击事件
Array.prototype.forEach.apply(hdList,[(current,index) => {
	current.addEventListener('click',() => {
		animationFn(index);
	},false);
}]);

//添加点击事件
Array.prototype.forEach.bind(hdList)((current,index) => {
	current.addEventListener('click',() => {
		animationFn(index);
	},false);
});