js 常用功能

// 判断是否是手机
function isMobile() {
    var browser = {
        versions: function () {
            var u = navigator.userAgent, app = navigator.appVersion;
            return {         //移动终端浏览器版本信息
                trident: u.indexOf('Trident') > -1, //IE内核
                presto: u.indexOf('Presto') > -1, //opera内核
                webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核
                gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核
                mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
                ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
                android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或uc浏览器
                iPhone: u.indexOf('iPhone') > -1, //是否为iPhone或者QQHD浏览器
                iPad: u.indexOf('iPad') > -1, //是否iPad
                webApp: u.indexOf('Safari') == -1 //是否web应该程序，没有头部与底部
            };
        }(),
        language: (navigator.browserLanguage || navigator.language).toLowerCase()
    }
    if (browser.versions.mobile) {
        return true;
    } else {
        return false;
    }
}

// 动态加载css
function includeLinkStyle(url) {
    var link = document.createElement("link");
    link.rel = "stylesheet";
    link.type = "text/css";
    link.href = url;
    document.getElementsByTagName('body')[0].appendChild(link);
}
 
// 合并数组对象
var merge = tableTunnel.map((item) => {
 　 let location = data.find(data => data.tuniface === item.tuniface);
　　return { ...item, ip: location.ip, address: location.address }
});


/**
 * @desc 函数防抖
 * @param fn 函数
 * @param delay 延迟执行毫秒数 默认0.5s
 */
export function debounce(fn, delay) {
  var delay = delay || 700;
  var timer;
  return function () {
    console.log('调用了debounce方法')
    let args = arguments;
    if (timer) {
      clearTimeout(timer);
    }
    timer = setTimeout(() => {
      timer = null;
      fn.apply(this, args);
    }, delay);
  }
}

/**
* @desc 函数节流
* @param fn 函数
* @param interval 函数执行间隔时间毫秒数 默认1s
*/
export function throttle(fn, interval) {
  var last;
  var timer;
  var interval = interval || 1000;
  return function () {
    console.log('调用了throttle方法')
    var th = this;
    var args = arguments;
    var now = +new Date();
    if (last && now - last < interval) {
      clearTimeout(timer);
      timer = setTimeout(function () {
        last = now;
        fn.apply(th, args);
      }, interval);
    } else {
      last = now;
      fn.apply(th, args);
    }
  }
}

let attr = ["name",'age']
let data = [{name:'zhangsan',age:18, gender:'男'},{name:'李四',age:19, gender:'女'},{name:'王二',age:28, gender:'男'}]

console.log(data.map(v=>attr.map(j=>v[j])));