基本數(shù)據(jù)類型
js的基本類型相對(duì)較多液肌，這里只列舉了部分，更詳細(xì)的文檔可以參考
整數(shù)型
var age = 18;
console.log('age is %d', age);
console.log('age is %d', age + 2);
字符類型
var name = 'xiaoming';
console.log('name is %s', name);
console.log('name is %s', name + ' zhang');
布爾型
var isAdult = false;
if (age >= 18)
isAdult = true;
else
isAdult = false;
console.log('%s %s', name, isAdult?'is Adult':'isn\'t Adult');
列表
var myLikeColorsList = ['blue', 'green', 'black', 'white'];
console.log("myLikeColorsList has %d colors", myLikeColorsList.length);
console.log("\tFirst color is %s", myLikeColorsList[0]);
// add one to the end
myLikeColorsList.push('purple');
// delete one at the beginning
myLikeColorsList.splice(0,1);
for (color in myLikeColorsList)
console.log("I like %s", myLikeColorsList[color]);
自定義對(duì)象
var JsLessonInfo = {
teacher: name,
title: 'JavaScript編程入門',
beginTime: '2018/8/8',
endTime: '2018/9/4',
Student: 417,
lessionTarget: '幫助更多小白學(xué)習(xí)JavaScript',
githubUrl: 'https://github.com/xugy0926/getting-started-with-javascript'
};
console.log(JsLessonInfo);
JsLessonInfo.teacher = name + ' zhang';
console.log("Teacher name: %s", JsLessonInfo.teacher);
// syntax suguar
var xiaoming = {
name,
age
}
console.log("%s is %d year's old", xiaoming.name, xiaoming.age);
流程控制
分支語句
if (age >= 80)
console.log("A god");
else if (age >= 60)
console.log("An elder");
else if (age >= 40)
console.log("A strong");
else
console.log("A child");
switch分支
switch(age)
{
case 0:
console.log("new baby");
break;
case 18:
console.log("grown up");
break;
default:
console.log("living?")
}
for循環(huán)
for (var i = 0; i < myLikeColorsList.length; i++)
console.log(myLikeColorsList[i])
while循環(huán)
var i = 0;
while (i < myLikeColorsList.length) {
console.log(myLikeColorsList[i]);
i++;
}
函數(shù)
function sum_to(n)
{
var sum = 0;
var i = 0;
for (i = 0; i <= n; i++) {
sum += i;
}
return sum;
}
console.log(sum(10));
