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js数据类型与分支

kiraseo_wwwkiraercom
kiraseo_wwwkiraercom原创
2022年07月20日 23:04:42334浏览

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

  1. let a = 'abc'; 
  2. console.log("++++string 数据类型+++++");
  3. console.log(typeof a);
  4. console.log("++++++++++++++++++++++++++++");
  5. let b =  123;  
  6. console.log("++++number 数据类型+++++");
  7. console.log(typeof  b);
  8. console.log("++++++++++++++++++++++++++++");
  10. let c =  ['Apple' ,  'Pear'  ,  'Banana'];  
  11. console.log("++++array 数据类型+++++");
  12. console.log(typeof  c);
  13. console.log("++++++++++++++++++++++++++++");
  14. let d =  {
  15. id:1,
  16. name: 'kira',
  17. num:61952,
  18. }
  19. console.log("++++object 数据类型+++++");
  20. console.log(typeof  d);
  21. console.log("++++++++++++++++++++++++++++");
  22. console.log("2. 实例演示所有分支与循环类型 ");
  23. console.log("++++for循环方式+++++");

输出效果

输出效果

实例演示所有分支与循环类型

演示代码如下

  1. console.log("2. 实例演示所有分支与循环类型 ");
  2.         console.log("++++for循环方式+++++");
  3.         for(let i=0;   i< c.length;  i++){
  4.                 console.log( c[i] );
  5.         }
  6.         console.log("++++++++++++++++++++++++++++");
  7.         console.log("++++ for -in循环方式+++++");
  8.         for(let  item  in  d ){
  9.             console.log( item+":"+d[item] );
  10.         }
  11.         console.log("++++++++++++++++++++++++++++");
  12.         console.log("++++多分支+++++");
  13.         let age = 128;
  14.         if(age >=18  &&  age<35){
  15.             console.log('可以吃糖啦!');
  16.         }
  17.         else if(age >=35  &&  age<50){
  18.             console.log('建议少吃糖!');
  19.         }
  20.         else if(age<18  ||   age >60){
  21.             console.log('不能吃糖!');
  22.         }
  23.         else{
  24.             console.log('不建议吃糖!');
  25.         }
  26.         console.log("++++++++++++++++++++++++++++");
  27.         console.log("++++++单分支+++++++");
  28.         let scores = 60;
  29.         if(scores>=60){
  30.             console.log('您的分数及格啦!!!');
  31.         }
  32.         console.log("++++++++++++++++++++++++++++");
  33.         scores = 55;
  34.         if(scores>=60){
  35.             console.log('您的分数及格啦!!!');
  36.         }else{
  37.             console.log('不及格啦,要多加强学习啦!!!');
  38.         }

输出效果

输出效果

完整代码如下

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8. </head>
  9. <body>
  10.     <script>
  11.         //  1. 实例演示常用数据类型,特别是引用类型 
  12.         console.log("实例演示常用数据类型,特别是引用类型 ");
  13.         let a = 'abc'; 
  14.         console.log("++++string 数据类型+++++");
  15.         console.log(typeof a);
  16.         console.log("++++++++++++++++++++++++++++");
  17.         let b =  123;  
  18.         console.log("++++number 数据类型+++++");
  19.         console.log(typeof  b);
  20.         console.log("++++++++++++++++++++++++++++");
  22.         let c =  ['Apple' ,  'Pear'  ,  'Banana'];  
  23.         console.log("++++array 数据类型+++++");
  24.         console.log(typeof  c);
  25.         console.log("++++++++++++++++++++++++++++");
  26.         let d =  {
  27.             id:1,
  28.             name: 'kira',
  29.             num:61952,
  30.         }
  31.         console.log("++++object 数据类型+++++");
  32.         console.log(typeof  d);
  33.         console.log("++++++++++++++++++++++++++++");
  34.         console.log("2. 实例演示所有分支与循环类型 ");
  35.         console.log("++++for循环方式+++++");
  36.         for(let i=0;   i< c.length;  i++){
  37.                 console.log( c[i] );
  38.         }
  39.         console.log("++++++++++++++++++++++++++++");
  40.         console.log("++++ for -in循环方式+++++");
  41.         for(let  item  in  d ){
  42.             console.log( item+":"+d[item] );
  43.         }
  44.         console.log("++++++++++++++++++++++++++++");
  45.         console.log("++++多分支+++++");
  46.         let age = 128;
  47.         if(age >=18  &&  age<35){
  48.             console.log('可以吃糖啦!');
  49.         }
  50.         else if(age >=35  &&  age<50){
  51.             console.log('建议少吃糖!');
  52.         }
  53.         else if(age<18  ||   age >60){
  54.             console.log('不能吃糖!');
  55.         }
  56.         else{
  57.             console.log('不建议吃糖!');
  58.         }
  59.         console.log("++++++++++++++++++++++++++++");
  60.         console.log("++++++单分支+++++++");
  61.         let scores = 60;
  62.         if(scores>=60){
  63.             console.log('您的分数及格啦!!!');
  64.         }
  65.         console.log("++++++++++++++++++++++++++++");
  66.         scores = 55;
  67.         if(scores>=60){
  68.             console.log('您的分数及格啦!!!');
  69.         }else{
  70.             console.log('不及格啦,要多加强学习啦!!!');
  71.         }
  72.     </script>
  73. </body>
  74. </html>

完整输出效果

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