標籤：cti var back s函數 賦值 document write span type
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> </head> <body> <script type="text/javascript"> //變數範圍 var x=1; function test(){ document.write(‘函數體內x的值為:‘+x+‘<br/>‘); //undefined,x值取下面的，但是取不到值 var x=19; document.write(‘函數體內對x重新賦值，此時x的值為：‘+x+‘<br/>‘); //19 } document.write(‘函數體外x的值為：‘+x+‘<br/>‘); //1 test(); document.write(‘x的值為：‘+x+‘<br/>‘); //1 //document.write(‘<hr color="red"/>‘); </script> </body></html>
JS函數03
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