js数据类型与分支
实例演示常用数据类型,特别是引用类型
演示代码如下
let a = 'abc'; console.log("++++string 数据类型+++++");console.log(typeof a);console.log("++++++++++++++++++++++++++++");let b = 123; console.log("++++number 数据类型+++++");console.log(typeof b);console.log("++++++++++++++++++++++++++++");let c = ['Apple' , 'Pear' , 'Banana']; console.log("++++array 数据类型+++++");console.log(typeof c);console.log("++++++++++++++++++++++++++++");let d = {id:1,name: 'kira',num:61952,}console.log("++++object 数据类型+++++");console.log(typeof d);console.log("++++++++++++++++++++++++++++");console.log("2. 实例演示所有分支与循环类型 ");console.log("++++for循环方式+++++");
输出效果
实例演示所有分支与循环类型
演示代码如下
console.log("2. 实例演示所有分支与循环类型 "); console.log("++++for循环方式+++++"); for(let i=0; i< c.length; i++){ console.log( c[i] ); } console.log("++++++++++++++++++++++++++++"); console.log("++++ for -in循环方式+++++"); for(let item in d ){ console.log( item+":"+d[item] ); } console.log("++++++++++++++++++++++++++++"); console.log("++++多分支+++++"); let age = 128; if(age >=18 && age<35){ console.log('可以吃糖啦!'); } else if(age >=35 && age<50){ console.log('建议少吃糖!'); } else if(age<18 || age >60){ console.log('不能吃糖!'); } else{ console.log('不建议吃糖!'); } console.log("++++++++++++++++++++++++++++"); console.log("++++++单分支+++++++"); let scores = 60; if(scores>=60){ console.log('您的分数及格啦!!!'); } console.log("++++++++++++++++++++++++++++"); scores = 55; if(scores>=60){ console.log('您的分数及格啦!!!'); }else{ console.log('不及格啦,要多加强学习啦!!!'); }
输出效果
完整代码如下
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title></head><body> <script> // 1. 实例演示常用数据类型,特别是引用类型 console.log("实例演示常用数据类型,特别是引用类型 "); let a = 'abc'; console.log("++++string 数据类型+++++"); console.log(typeof a); console.log("++++++++++++++++++++++++++++"); let b = 123; console.log("++++number 数据类型+++++"); console.log(typeof b); console.log("++++++++++++++++++++++++++++"); let c = ['Apple' , 'Pear' , 'Banana']; console.log("++++array 数据类型+++++"); console.log(typeof c); console.log("++++++++++++++++++++++++++++"); let d = { id:1, name: 'kira', num:61952, } console.log("++++object 数据类型+++++"); console.log(typeof d); console.log("++++++++++++++++++++++++++++"); console.log("2. 实例演示所有分支与循环类型 "); console.log("++++for循环方式+++++"); for(let i=0; i< c.length; i++){ console.log( c[i] ); } console.log("++++++++++++++++++++++++++++"); console.log("++++ for -in循环方式+++++"); for(let item in d ){ console.log( item+":"+d[item] ); } console.log("++++++++++++++++++++++++++++"); console.log("++++多分支+++++"); let age = 128; if(age >=18 && age<35){ console.log('可以吃糖啦!'); } else if(age >=35 && age<50){ console.log('建议少吃糖!'); } else if(age<18 || age >60){ console.log('不能吃糖!'); } else{ console.log('不建议吃糖!'); } console.log("++++++++++++++++++++++++++++"); console.log("++++++单分支+++++++"); let scores = 60; if(scores>=60){ console.log('您的分数及格啦!!!'); } console.log("++++++++++++++++++++++++++++"); scores = 55; if(scores>=60){ console.log('您的分数及格啦!!!'); }else{ console.log('不及格啦,要多加强学习啦!!!'); } </script></body></html>
完整输出效果
