实现节流函数（throttle）
# 时间戳版
function throttle(func, wait) {
var context, args;
var previous = 0;
return function() {
var now = +new Date();
context = this;
args = arguments;
if (now - previous > wait) {
func.apply(context, args);
previous = now;
}
}
}
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# 定时器版
function throttle(func, wait) {
var context, args;
var timeout = null;
return function () {
context = this;
args = arguments;
if (!timeout) {
func.apply(context, args);
timeout = setTimeout(() => {
timeout = null;
}, wait);
}
}
}
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