引入第三个变量:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>学习javascript</title> </head> <body> <script type="text/javascript"> var a=10; var b=20; console.log("a=",a,"b=",b); var temp=a; a=b; b=temp; console.log("a=",a,"b=",b); </script> </body> </html>不引入第三个变量:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>学习javascript</title> </head> <body> <script type="text/javascript"> var a=10; var b=20; console.log("a=",a,"b=",b); a=a+b; b=a-b; a=a-b; console.log("a=",a,"b=",b); </script> </body> </html>
