案例:
<script type="text/javascript"> var name; name = '张三'; </script>
案例2:
<script type="text/javascript"> var name = '张三'; </script>
案例3:
<script type="text/javascript"> var name,age,sex; </script>
案例3:
<script type="text/javascript"> var name = '张三',age = 23,sex = '男'; </script>
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