2022-05-15 04:29:13【The evening wind blows】
Use var Keyword declaration variables , The declared variable can be called after assignment
<script> var num = "haha"; document.write(num) </script>
- Can contain letters 、 Numbers 、 Underscores and dollar symbols
- Must start with a letter
- Sure $ and _ start （ Generally not recommended ）
- Case sensitive （y and Y It's a different variable ）
1、 The variable must use var Keyword statement
2、 Assignment is required after variable declaration , For assignment =
3、 Defining variables should follow the naming rules
author[The evening wind blows],Please bring the original link to reprint, thank you.
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