1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> 5 <title>return</title> 6 <script type="text/javascript"> 7 window.onload=num; 8 console.log(num(1)); //1 9 console.log(num(2)); //2 10 console.log(num(3)); //null 11 12 function num(node){ 13 if(node==1){ return 1;}; 14 if(node==2){ return 2;}; 15 return null; 16 } 17 </script> 18 </head> 19 <body> 20 </body> 21 </html>
1 <script type="text/javascript"> 2 window.onload=num; 3 running=true; 4 console.log(num(1)); //false; 5 console.log(num(2)); //true alert(22); 6 console.log(num(3)); //true alert(22); 7 8 function num(node){ 9 if(node==1){ return false;}; 10 alert(22); 11 return true; 12 } 13 </script>