var _Set;/* istanbul ignore if */if (typeof Set !== 'undefined' && isNative(Set)) {  // use native Set when available.//当本地set有效时使用set  _Set = Set;} else {  // a non-standard Set polyfill that only works with primitive keys.//一个不标准的set只会和一些简单的键工作  _Set = (function () {    function Set () {      this.set = Object.create(null);    }    Set.prototype.has = function has (key) {      return this.set[key] === true    };    Set.prototype.add = function add (key) {      this.set[key] = true;    };    Set.prototype.clear = function clear () {      this.set = Object.create(null);    };    return Set;  }());}var perf;//性能{//代码块这是es6中的，代替了立即执行匿名函数  perf = inBrowser && window.performance;//Web Performance API允许网页访问某些函数来测量网页和Web应用程序的性能，包括  API和高分辨率时间数据。  if (perf && (!perf.mark || !perf.measure)) {    perf = undefined;  }}/*  */var emptyObject = Object.freeze({});//冻结一个空的对象/** * Check if a string starts with $ or _//检查一个字符串是否以$或者下划线为开头 */function isReserved (str) {  var c = (str + '').charCodeAt(0);//把参数转为字符串获取第一个字符  return c === 0x24 || c === 0x5F}/** * Define a property.//定义一个属性 */function def (obj, key, val, enumerable) {  Object.defineProperty(obj, key, {//Object.defineProperty给对象定义属性    value: val,    enumerable: !!enumerable,    writable: true,    configurable: true  });}/** * Parse simple path.//解析简单的路径 */var bailRE = /[^\w.$]/;function parsePath (path) {  if (bailRE.test(path)) {    return  } else {    var segments = path.split('.');    return function (obj) {      for (var i = 0; i < segments.length; i++) {        if (!obj) { return }        obj = obj[segments[i]];      }      return obj    }  }}var warn = noop;var tip = noop;var formatComponentName;{  var hasConsole = typeof console !== 'undefined';  var classifyRE = /(?:^|[-_])(\w)/g;  var classify = function (str) { return str    .replace(classifyRE, function (c) { return c.toUpperCase(); })    .replace(/[-_]/g, ''); };  warn = function (msg, vm) {    if (hasConsole && (!config.silent)) {      console.error("[Vue warn]: " + msg + " " + (        vm ? formatLocation(formatComponentName(vm)) : ''      ));    }  };  tip = function (msg, vm) {    if (hasConsole && (!config.silent)) {      console.warn("[Vue tip]: " + msg + " " + (        vm ? formatLocation(formatComponentName(vm)) : ''      ));    }  };  formatComponentName = function (vm, includeFile) {//格式化组件名称    if (vm.$root === vm) {      return '
     
      '    }    var name = vm._isVue      ? vm.$options.name || vm.$options._componentTag      : vm.name;    var file = vm._isVue && vm.$options.__file;    if (!name && file) {      var match = file.match(/([^/\\]+)\.vue$/);      name = match && match[1];    }    return (      (name ? ("<" + (classify(name)) + ">") : "
      
       ") +      (file && includeFile !== false ? (" at " + file) : '')    )  };  var formatLocation = function (str) {    if (str === "
       
        ") {      str += " - use the \"name\" option for better debugging messages.";    }    return ("\n(found in " + str + ")")  };}