例子
<script> var a = "heh" function findLove(){ console.log(a); function findforyou(){ var a ="you"; console.log(a); } function findother(){ console.log(a) } findforyou(); findother(); } findLove(); </script>
输出
heh
you
heh
例子
<script> var test_id = "my love"; if(true){ console.log(test_id); var test_id = "where my love?"; console.log(test_id); } console.log(test_id); </script>
输出
my love where my love? where my love?
例子
<script> var test_id = "my love"; function findLove(){ var test_id ; console.log(test_id); test_id = "is you?"; console.log(test_id); } findLove(); console.log(test_id); </script>
输出
undefined is you? my love
例子
<script> var a = "heh" if(true){ console.log(a); } </script>
输出
heh
例子
<script> var a = "heh" function findLove(){ console.log(a); } findLove(); </script>
输出
heh
例子
<script> var a = "heh" function findLove(){ console.log(a); var a } findLove(); </script>
输出
undefined