62 lines
1.5 KiB
JavaScript
62 lines
1.5 KiB
JavaScript
/* js 相关的工具函数 */
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/**
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* @description [throttle 节流函数]
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* @author shanshuizinong
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* @param {Function} fn 延时调用函数
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* @param {Number} delay 延迟多长时间
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* @param {Number} atleast 至少多长时间触发一次
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* @return {Function} 延迟执行的方法
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*/
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export function throttle(fn, delay = 1000, atleast = 1000) {
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let timer = null
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let previous = null
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return function() {
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let now = +(new Date())
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const args = arguments
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const ctx = this
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if (!previous) previous = now
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if (atleast && now - previous > atleast) {
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fn && fn.apply(ctx, args)
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previous = now
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clearTimeout(timer)
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} else {
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clearTimeout(timer)
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timer = setTimeout(function() {
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fn && fn.apply(ctx, args)
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previous = null
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}, delay)
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}
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}
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}
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//防抖
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function debounce(fun, delay) {
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return function(args) {
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//获取函数的作用域和变量
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let that = this
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let _args = args
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//每次事件被触发，都会清除当前的timeer，然后重写设置超时调用
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clearTimeout(fun.id)
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fun.id = setTimeout(function() {
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fun.call(that, _args)
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}, delay)
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}
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}
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export function uuid() {
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var s = [];
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var hexDigits = "0123456789abcdef";
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for (var i = 0; i < 36; i++) {
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s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
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}
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s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
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s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
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s[8] = s[13] = s[18] = s[23] = "-";
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var uuid = s.join("");
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return uuid;
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}
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