数据类型转换 - 冰冰点灯

数据类型转换
 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <meta charset="UTF-8">
 5         <title>数据类型转换</title>
 6         <script type="text/javascript">
 7             /*
 8             var a1=1;
 9             var a2=23.45;
10             var a3=-34.1;
11             */
12             
13             //var n1=String(a1); //转化为字符串
14             //var n1=a1.toString(); //转化为字符串  变量.toString
15             //alert(n1);
16             //alert(typeof(n1));
17             
18             /*var b1="123";
19             var b2="12abc";
20             var b3="mylove";
21             */var b4="14期威武"
22             var b6="3.56";
23             //var b5=Number(b4);
24             //var b5=parseInt(b4)
25             //var b5=parseFloat(b4);
26             
27             var c1=123;
28             var c2="345";
29             var c3;
30             var c4=null;
31             var c5=0;
32             var c6=Infinity;
33             var c7=Boolean(c6);
34             
35             
36             var d1=12;
37             var d2="3";
38             var d3=d1-d2;
39             alert(d3);  
40             alert(typeof(d3)); //类型自动转换为number类型
41             
42         </script>
43     </head>
44     <body>
45     </body>
46 </html>
posted on 2019-01-08 10:48 冰冰点灯阅读(141) 评论(0) 收藏举报