平常的我们:

/**
 * 函数防抖
 */
export function debounce(fn, delay) {
  var timer = null;
  var delay = delay || 200;
  return function() {
    var args = arguments;
    var that = this;
    clearTimeout(timer)
    timer = setTimeout(function() {
        fn.apply(that,args)
    }, delay);
  }
}
/** * 函数节流 */
export function throttle(fn,delay){
  var lastTime;
  var timer;
  var delay = delay || 200;
  return function() {
    var args = arguments;
    var nowTime = Date.now();
    if (lastTime && nowTime - lastTime < delay) {
      clearTimeout(timer);
      timer = setTimeout(function () {
        lastTime = nowTime;
        fn.apply(this, args);
      }, delay);
    }else{
      lastTime = nowTime;
      fn.apply(this, args);
    }
  }
}

如今直接用装饰器操作

import { throttle, debounce } from 'lodash'
/**
 * 函数节流装饰器
 * @param {number} wait 节流的毫秒
 * @param {Object} options 节流选项对象
 * [options.leading=true] (boolean): 指定调用在节流开始前。
 * [options.trailing=true] (boolean): 指定调用在节流结束后。
 */
export const throttle =  function(wait, options = {}) {
  return function(target, name, descriptor) {
    descriptor.value = throttle(descriptor.value, wait, options)
  }
}

/**
 * 函数防抖装饰器
 * @param {number} wait 需要延迟的毫秒数。
 * @param {Object} options 选项对象
 * [options.leading=false] (boolean): 指定在延迟开始前调用。
 * [options.maxWait] (number): 设置 func 允许被延迟的最大值。
 * [options.trailing=true] (boolean): 指定在延迟结束后调用。
 */
export const debounce = function(wait, options = {}) {
  return function(target, name, descriptor) {
    descriptor.value = debounce(descriptor.value, wait, options)
  }
}

封装之后再组件中使用

import {debounce} from '@/decorator'

export default {
  methods:{
    @debounce(100)
    resize(){}
  }
}
Last modification:August 3rd, 2020 at 09:46 pm
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