<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>返回值函數(shù)</title><script type="text/javascript">?function ?app2(x,y)? {? ? sum = x * y;? ?return sum;?? }?var req1=app2(5,6);?var req2=app2(2,3);document.write("req1的值:"+req1+"<br/>");document.write("req2的值:"+req2+"<br/>");</script></head><body></body></html>1 為什么函數(shù)里的 sum ?x ?y不用定義2 ?為什么我把return sum 去掉就成了 defined
JS return的問題
樂游盧鵬程
2016-05-26 14:42:47
