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                ## 1.5 定界符與占位符號 Beetl模板語言類似JS語言和習俗,只需要將Beetl語言放入定界符號里即可,如默認的是<% %> ,占位符用于靜態文本里嵌入占位符用于輸出,如下是正確例子 ```javascript <% var a = 2; var b = 3; var result = a+b; %> hello 2+3=${result} ``` **千萬不要**在定界符里使用占位符號,因為占位符僅僅嵌在靜態文本里,如下例子是**錯誤**例子 ```javascript <% var a = "hi"; var c = ${a}+"beetl"; //應該是var c = a+"beetl" %> ``` 定界符和占位符 通常還有別的選擇,如下定界符 - @ 和回車換行 (此時,模板配置DELIMITER_STATEMENT_END= 或者 DELIMITER_STATEMENT_END=null 都可以) - \#: 和回車換行 - &lt;!\-\-: 和 \-\-&gt; - &lt;!\-\-# 和 \-\-&gt; - &lt;? 和 ?&gt; 占位符\-\-#{ }\-\#\# 你也可以與團隊達成一致意見來選擇團隊喜愛的定界符號和占位符號。 定界符號里是表達式,如果表達式跟定界符或者占位符有沖突,可以在用 “\” 符號,如 ```javascript @for(user in users){ email is ${user.name}\@163.com @} ${[1,2,3]} //輸出一個json列表 ${ {key:1,value:2 \} } //輸出一個json map,} 需要加上\ ```
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