<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>返回值函數</title><script type="text/javascript">? function ?app2(x,y)? { var sum,x,y;? ? sum = x * y;return sum;? }?req1=app2(5,6);?req2=app2(2,3);?function z(x,y){ z=x+y; return z;} sump=z(req1,req2);document.write("req1的值:"+req1+"<br/>");document.write("req2的值:"+req2+"<br/>");document.write(req1+"與"+req2+"和:"+sumq);</script></head><body></body></html><!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>返回值函數</title><script type="text/javascript">? function ?app2(x,y)? { var sum,x,y;? ? sum = x * y;return sum;? }?req1=app2(5,6);?req2=app2(2,3);?sump=req1+req2;document.write("req1的值:"+req1+"<br/>");document.write("req2的值:"+req2+"<br/>");document.write(req1+"與"+req2+"和:"+sumq);</script></head><body></body></html>兩種都是顯示相同的代碼，如下req1的值:30req2的值:6
為什么 不能顯示sump的值，即和的值？ 兩種代碼都不能顯示
馬小黑
2015-07-14 22:34:40
