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                企業??AI智能體構建引擎,智能編排和調試,一鍵部署,支持知識庫和私有化部署方案 廣告
                轉載自[生活沒有if-else的博客](http://blog.csdn.net/chentravelling):[http://blog.csdn.net/chentravelling/article/details/43090085](http://blog.csdn.net/chentravelling/article/details/43090085) ### 一、JavaScript注釋: 1.單行注釋: 符號:// ~~~ //document.write("hello?world");??該句話就會被注釋而不會被執行。 ~~~ 2.多行注釋: 符號:/*...*/ ~~~ /*?document.write("hello?world<br>");? ???document.write("hello?world<br>");? */???//該兩句就不會被執行?? ~~~ ### 二、HTML注釋: 符號:<?!--.......--> 1.在HMTL語句中注釋: ~~~ <!--? document.write("hello?world"); -->?//該句就不會被執行?? ~~~ 2.在JS語句中使用:【需要在<script>與</script>之間使用】 ~~~ <script?language?=?"javascript"?type?=?"text/javascript">?? ????????<!--? ????????document.write("hello?world,this?is?my?first?js?webpage?-?1<br>");? ????????-->?? ????</script>//不支持JavaScript的瀏覽器則會不會執行document.write("hello?world,this?is?my?first?js?webpage?-?1<br>");而在支持JavaScript的瀏覽器還是會執行該句。?? ~~~ 例子:【可以直接復制粘貼,運行,查看結果】 ~~~ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <span style="white-space:pre"> </span><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>The Web Development </title> <span style="white-space:pre"> </span> <!----------------------<span style="color:#ff0000;">插入js代碼,必須放在<script>與</script>標簽之間</span>----------------------> <script language = "javascript" type = "text/javascript"> <!-- document.write("hello world,this is my first js webpage - 1<br>"); --> </script> <!----------------------------------------------------------------------------------------> <span style="white-space:pre"> </span></head> <span style="white-space:pre"> </span><body> <span style="white-space:pre"> </span></body> </html> ~~~ 分析: 第6行和第12行代碼屬于HTML代碼,使用<!--...-->標簽注釋的句子將不會被執行; 第8行和第10行屬于js代碼【位于<script>與</script>之間】,此時不支持JavaScript的瀏覽器則會不會執行第9句,而在支持JavaScript的瀏覽器還是會執行第9句。 使用注釋標簽來隱藏瀏覽器不支持的腳本也是一個好習慣(這樣就不會把腳本顯示為純文本)。 web前端開發系列筆記:http://blog.csdn.net/chentravelling/article/category/2857107
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