var numbers = [15.5, 2.3, 1.1, 4.7];
function getSum(total, num) {
  return total + Math.round(num);
}
function myFunction(item) {
  var a  = numbers.reduce(getSum , 0);
console.log(a)
}
myFunction();

var numbers = [15.5, 2.3, 1.1, 4.7];
function getSum(total, num) {
  return total + Math.round(num);
}
function myFunction(item) {
  var a  = numbers.reduce(getSum);
console.log(a)
}
myFunction();

<div id="parent">
  <user-profile ref="profile"></user-profile>
</div>

var child = this.$refs.profile;
child.x();

export const bus = new Vue()

import {bus} from 'path/to/main'

bus.$emit('customEventName', optionalParameter)

import {bus} from 'path/to/main'

bus.$on('customEventName', this.methodYouWannaCall)

import ChildForm from './components/ChildForm'

new Vue({
  el: '#app',
  data: {
    item: {},
    bus: new Vue(),
  },
  template: `
  <div>
     <ChildForm :item="item" :bus="bus" ref="form" />
     <button type="submit" @click.prevent="submit">Post</button>
  </div>
  `,
  methods: {
    submit() {
      this.bus.$emit('submit')
    }
  },
  components: { ChildForm },
})

<template> </template>
<script>
export default {
  name: 'NowForm',
  props: ['item', 'bus'],
  methods: {
    submit() {
        ...
    }
  },
  mounted() {
    this.bus.$on('submit', this.submit)
  },  
}
</script>

console.log(this.$attrs);

console.log(this.$root.$children[0].$children[0].$data);

module.exports = {
  devServer: {
    host: 'gs'  // 本机域名
  }
}

<h3>type=radio 的只读问题</h3>
      
<form>
  
  <div>
    <div>input readonly</div>
    <div>还是可以点击</div>
    <label><input type="radio" name="aa" readonly >111</label>
    <label><input type="radio" name="aa" readonly checked>222</label>
  </div>

  <div>
    <div>input disabled</div>
    <div>不能点击；但也不能提交</div>
    <label><input type="radio" name="bb" disabled >111</label>
    <label><input type="radio" name="bb" disabled checked>222</label>
  </div>

  <h3>我们需要的是：不能点击但要提交！</h3>

  <h3>解决办法一</h3>
  <div>onclick="return false</div>
  <div>
    <div>input onclick="return false"</div>
    <div></div>
    <label><input type="radio" name="cc" onclick="return false" >111</label>
    <label><input type="radio" name="cc" onclick="return false" checked>222</label>
  </div>

  <h3>解决办法二</h3>

   <div>
    <div>用 css 禁止点击</div>
    <label class="disabled"><input type="radio" name="dd" onclick="return false" >111</label>
    <label class="disabled"><input type="radio" name="dd" onclick="return false" checked>222</label>
  </div>
      <button> 提交 </button>
</form>

<style type="text/css">
input[type="radio"][readonly],label.disabled {
  pointer-events: none;
}
</style>

private NdefRecord createRecord(String uri) throws UnsupportedEncodingException {
    byte[] uriBytes = uri.getBytes("UTF-8");
    byte[] payload = new byte[1 + uriBytes.length];

    // set prefix byte (see URI RTD for possibile values, we just use 0 indicating no prefix for now)
    payload[0] = 0;

    // copy uriBytes into payload
    System.arraycopy(uriBytes, 0, payload, 1, uriBytes.length);

    return new NdefRecord(NdefRecord.TNF_WELL_KNOWN,
                          NdefRecord.RTD_URI,
                          null,
                          payload);
}

<intent-filter>
  <action android:name="android.nfc.action.NDEF_DISCOVERED"/>                 
  <data android:scheme="http" android:host="www.google.com" />
  <category android:name="android.intent.category.DEFAULT"/>
</intent-filter>

function* g(i) {
  yield i;
  yield i + i;
}

let a = g(3);
// console.log(a)

console.log(a.next().value);
console.log(a.next().value);
console.log(8888);

function *foo() {
  yield 1;
  yield 2;
  yield 3;
  return;
}
for(let v of foo()) {
  console.log(v);
}

function* dd(n){
  var index = 0;
  while(index < n)
    yield index++;
}

let a = dd(2);

console.log(a.next());
console.log(a.next());
console.log(a.next());
console.log(a.next());
console.log(a.next());

var c = console;

function arrayIterator(array){
  var i = 0;
  var obj = {
    next: function(){
      return i < array.length ?
        {value: array[i++], done: false} :
        {value: undefined, done: true};
    }
  }
  return obj;
}

var ai = arrayIterator(['x', 'y', 'z']);

c.log(ai.next()); // { value: "x", done: false }
c.log(ai.next()); // { value: "y", done: false }
c.log(ai.next()); // { value: "z", done: false }
c.log(ai.next()); // { value: undefined, done: true }

var fs = require('fs');
var gen;

function run(generator) {
  gen = generator();
  gen.next();
}

function read(file) {
  fs.readFile(file, function(err, data) {
    if (!err) console.log('read %s success!', file);
    gen.next(data);
  });
}

function write(file, data) {
  fs.writeFile(file,  data, function(err) {
    if (!err) console.log('write %s success!', file);
    gen.next();
  });
}

run(function* () { 
  var text = yield read('yieldFile.js');
  yield write('yieldFile.bak', text);
});

async function asynctest() {
    console.log('start');
    await call();
    await normalFunction();
    await new Promise(resolve=>{ console.log('wait result'); resolve()});
    console.log('end');
}
asynctest();

let aArray = ['a',123,{a:'1',b:'2'}]
for(let index in aArray){
    console.log(`${aArray[index]}`);
}

for(var value of aArray){
    console.log(value);
}

var student={
    name:'wujunchuan',
    age:22,
    locate:{
    country:'china',
    city:'xiamen',
    school:'XMUT'
    }
}
for(var key of Object.keys(student)){
    //使用Object.keys()方法获取对象key的数组
    console.log(key+": "+student[key]);
}