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throttlingFun.html
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throttlingFun.html
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<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
<title>Throttling函数节流</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
</head>
<body>
<p>函数节流</p>
<pre>
确保在1000ms内只打印一次
</pre>
<button id="click">click</button>
<div id="add"></div>
<script>
var n = 0, contr_pr = contr(pr, 1000);
document.getElementById("click").onclick = function () {
n++;
this.innerHTML = "click:" + n
contr_pr(n);
}
function pr(q) {
var p = document.createElement("p");
p.innerHTML = "print:" + q;
document.getElementById("add").appendChild(p);
}
function contr(fn, interval) {
var t;
var isFirst = true;
var interval = interval || 500;
return function () {
if (isFirst) {
fn.apply(this, arguments);
isFirst = false;
t = new Date();
} else {
if ((new Date() - t) >= interval) {
fn.apply(this, arguments);
t = new Date();
}
}
}
}
var throttle = function (fn, interval) {
var __self = fn, // 保存需要被延迟执行的函数引用
timer, // 定时器
firstTime = true; // 是否是第一次调用
return function () {
var args = arguments,
__me = this;
if (firstTime) { // 如果是第一次调用，不需延迟执行
__self.apply(__me, args);
return firstTime = false;
}
if (timer) { // 如果定时器还在，说明前一次延迟执行还没有完成
return false;
}
timer = setTimeout(function () { //延迟一段时间执行
clearTimeout(timer);
timer = null;
__self.apply(__me, args);
}, interval || 500);
};
};
window.onresize = throttle(function () {
console.log(1);
}, 500);
</script>
</body>
</html>