<!DOCTYPE html> <html> <head> <title></title> </head> <body> <script type="text/javascript"> var num1="100"; var num2="200"; var num3="300"; document.write("num1='100' num2='200' num3='300'" ); var result=Number(num1)+Number(num2); document.write("<br>数值的运算结果为:",result); var st=String(num1); result=st+200; document.write("<br>字符串与数字的运算结果为:",result); var sr=Boolean(num2); result=sr*num1; document.write("<br>字符串与布尔值的运算结果为:",result); </script> </body> </html>
习惯受伤
Wang_Yu