docker

JavaScript

语法基础

基础对象

流程语法

循环

for (var index = 0; index < myArray.length; index++) {
  console.log(myArray[index]);
}

myArray.forEach(function (value) {
  console.log(value);
});

for (var prop in obj) {
  console.log("obj." + prop + " = " + obj[prop]);
}

//js 6
for (var value of myArray) {
  console.log(value);
}

let iterable = "boo";
for (let value of iterable) {
  console.log(value);
}

let iterable = new Map([["a", 1], ["b", 2], ["c", 3]]);
for (let [key, value] of iterable) {
  console.log(value);
}
for (let entry of iterable) {
  console.log(entry);
}
// [a, 1]

for (var key of Object.keys(someObject)) {
  console.log(key + ": " + someObject[key]);
}

// 还可以循环一个生成器
function* fibonacci() { // a generator function
  let [prev, curr] = [0, 1];
  while (true) {
    [prev, curr] = [curr, prev + curr];
    yield curr;
  }
}

for (let n of fibonacci()) {
  console.log(n);
  // truncate the sequence at 1000
  if (n >= 1000) {
    break;
  }
}

常用对象及函数

公共

encodeURI(fileName);

Object

const obj = {};
obj.a='a';
obj['a']='a';
Object.keys(obj).length;
Object.assign(obj1,obj2,obj3); //Object.assign(target, ...sources)
for (variable in object) { ...}; //不可修改

Array

const arr = ['a','b','c'];
console.log(arr.length);
arr[0];
arr.push("Hola");
arr.concat([1,2]);
if(arr instanceof Array) arr.join(',');
const words = ["spray", "limit", "elite", "exuberant", "destruction", "present"];
let longWords = words.filter(word => word.length > 6); // creates a new array
for (let value of iterable) { ... }; //注意和obj的区别
arrayObject.splice(index,howmany,item1,.....,itemX)

String

stringObject.slice(start,end)

Date

代码收集

垂直居中

css实现：上层元素height:100%,contain元素：display:flex

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