标签：flow family end api mil lib func margin hid
36Date.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
// Date 日期时间
var d = new Date();
//console.log(d.toString());
//console.dir(d);
console.log(d.getFullYear());// 年
console.log(d.getMonth()); // 0-11 0表示1月份
console.log(d.getDate()); // 日
console.log(d.getDay()); // 星期 0-6 0周日
console.log(d.getHours(),d.getMinutes(),d.getSeconds());
// 2019年06月11日 20:23:41 星期二
//console.log(d.toLocaleString());
function dateToString(d) {
var year = d.getFullYear();
var month = toTwo(d.getMonth() + 1);
var day = toTwo(d.getDate());
var h = toTwo(d.getHours());
var m = toTwo(d.getMinutes());
var s = toTwo(d.getSeconds());
var arr = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var weekday = arr[d.getDay()];
var str = `${year}年${month}月${day}日 ${h}:${m}:${s} ${weekday}`;
return str;
}
function toTwo(v) {
return v<10?‘0‘+v:v;
}
console.log(dateToString(d));
</script>
</body>
</html>
37Date-2.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
var str = "2000/12/12"; //
//var d = new Date();// 系统时间
/* 字符串转成日期格式
var d1 = new Date(str);
console.dir(d1);
var num = Date.parse(str); // 时间戳
var d2 = new Date(num);
console.log(d2.toLocaleString());
function stringToDate(str) {
return new Date(str);
}
*/
// 10天后的日期
//d.setDate(d.getDate()+10);
//console.log(d);
/*
console.log(d.getTime());
d = new Date(d.getTime()+10*24*3600*1000);
console.log(d);
*/
var d = new Date();
var d2 = new Date("2019/10/1");
function diff(start,end) {
return (end.getTime() - start.getTime())/1000
}
// 6 11
var days = parseInt(diff(d,d2)/24/3600);
console.log(days);
</script>
</body>
</html>
38object-es6.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
// 1 对象的解构赋值
var obj = {name: "along", age: 32};
//var {name,age} = obj;
// 旧名字(右边对象的属性名):新名字
var {name2:userName,age:userAge} = obj;
console.log(userName);
function ajax({method="get",data={}}) {
console.log(method,data);
}
/* 以前做法
function ajax(options) {
var method = options.method || ‘get‘;
var data = options.data || {};
}
*/
ajax({
data: {}
});
function fn(a=10,b=20) {
}
// 2 对象属性或方法简写
var name = "along";
var age = 32;
var teacher = {
name: name, // name: "along"
age: age,
teach: function() {
console.log("hard working");
}
};
//简写
var teacher2 = {
name, // name: "along"
age,
teach(){
console.log(arguments);
console.log("hard working");
}
};
console.log(teacher2.name,teacher2.age);
teacher2.teach();
// 3 新增api
//Object.is()
console.log( NaN === NaN); // false
console.log(+0 === -0); // true
// [NaN,19,NaN]
console.log(Object.is(NaN,NaN)); // true
console.log(Object.is(+0,-0)); // false
// Object.assign()
var obj1 = {x:10, y:20};
var obj2 = {z:30};
Object.assign(obj2,obj1);
console.log(obj2);
console.log(obj1);
// 克隆对象 浅层复制
function clone(obj) {
return Object.assign({},obj);
}
var obj3 = {a:10,b:{num:100}};
var obj4 = clone(obj3);
obj4.b.num = 200;
console.log(obj3.b.num);
var obj5 = {};
for(var key in obj3) {
obj5[key] = obj3[key];
};
console.log(obj5);
// Object.keys() Object.values()
var object = {a:1,b:2,c:3};
console.log(Object.keys(object)); //["a", "b", "c"]
console.log(Object.values(object));
// for of
for(var v of Object.keys([1,2,3])) {
console.log(v);
}
// 原型 super 第三季
</script>
</body>
</html>
03JavaScript程序设计修炼之道 2019-06-09_fe-js-053Math对象_ Date对象、es6对象新变化
标签：flow family end api mil lib func margin hid
原文地址：https://www.cnblogs.com/HiJackykun/p/11146723.html
