標籤：span type 函數 define fun func function 全域變數 ret
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> </head> <body> <script type="text/javascript"> //全域變數和局部變數的區別/* function test(){ var x=1; alert(x); } test(); alert(x); //取不到變數，報錯*/ function test(){ y=5; alert(y); }// test();// alert(y); var x=1,y=2; function calc(x,y){ document.write(‘a的值為‘+a+‘<br/>‘);//undefined document.write(‘函數體內x的值為：‘+x+‘<br/>‘); //1 document.write(‘函數體內y的值為：‘+y+‘<br/>‘); //2 var x=0,y=6; z=x+y; x=x+y; var a=198; document.write(‘a的值為：‘+a+‘<br/>‘); //198 document.write(‘x的值為：‘+x+‘<br/>‘); //6 return z; } //alert(calc(x,y)); //alert(x+‘-‘+y+‘-‘+z); var a=1,b=2; function test1(){ var a=5,b=10; return a+b; } function test2(){ var a=11,b=22; return a+b; } alert(test1()); alert(test2()); alert(a+‘--‘+b); </script> </body></html>
JS函數04
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
