lp-vue/lib/utils/debounce.js

vue2组件库&方法&指令集合

"use strict";

exports.__esModule = true;
exports.debounce = debounce;
function debounce(func, wait, immediate) {
  var timeout = void 0,
      args = void 0,
      context = void 0,
      timestamp = void 0,
      result = void 0;

  var later = function later() {
    // 据上一次触发时间间隔
    var last = +new Date() - timestamp;

    // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
    if (last < wait && last > 0) {
      timeout = setTimeout(later, wait - last);
    } else {
      timeout = null;
      // 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
      if (!immediate) {
        result = func.apply(context, args);
        if (!timeout) context = args = null;
      }
    }
  };

  return function () {
    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    context = this;
    timestamp = +new Date();
    var callNow = immediate && !timeout;
    // 如果延时不存在，重新设定延时
    if (!timeout) timeout = setTimeout(later, wait);
    if (callNow) {
      result = func.apply(context, args);
      context = args = null;
    }

    return result;
  };
}