What are the three ways to set cache in html
What are the three ways to set up cache in HTML? In web development, in order to improve user access speed and reduce server load, we can reduce web page loading time by setting cache. Next, I will introduce you to three commonly used HTML cache methods in detail and provide specific code examples.
Method 1: Set cache through HTTP response header
"Cache-Control" and "Expires" in the HTTP response header are two commonly used attributes for setting cache. By setting these two properties, you can control the browser's caching behavior for web content.
- Cache-Control attribute
The Cache-Control attribute is set in the HTTP response header and is used to specify how the browser caches the content of the web page. It can have multiple values, commonly used ones are:
- public: allows public caching, that is, all cache servers and browsers can cache the web page.
- private: Only private caching is allowed, that is, only the browser can cache the web page.
- no-store: Disable caching, the browser will not cache the content of the web page.
- max-age: Set the maximum validity time of the cache, in seconds.
The following is an example, setting Cache-Control to public and max-age to 3600 seconds (1 hour):
HTTP/1.1 200 OK Cache-Control: public, max-age=3600
- Expires attribute
The Expires attribute is an absolute time value used to specify the cache expiration time. This time is a date string in GMT format, indicating that the cache will expire after this time.
The following is an example, setting Expires to January 1, 2022:
HTTP/1.1 200 OK Expires: Sat, 01 Jan 2022 00:00:00 GMT
Method 2: Using HTML tags to set cache
In addition to setting cache attributes through HTTP response headers In addition, we can also use HTML tags to set up caching. Commonly used tags include and .
- Use the tag
The tag can be placed in the
tag of the web page to set cache attributes.The following is an example, setting Cache-Control to public and max-age to 3600 seconds:
<html> <head> <meta http-equiv="Cache-Control" content="public, max-age=3600"> </head> <body> <!-- 网页内容 --> </body> </html>
- Use the tag
The tag is used to introduce external resources, such as CSS files. We can set cache attributes in the tag.
The following is an example, set Cache-Control to public, max-age to 3600 seconds:
<link rel="stylesheet" href="styles.css" type="text/css"
http-equiv="Cache-Control" content="public, max-age=3600">Method 3: Use JavaScript to set the cache
In addition to using HTTP response headers In addition to setting cache attributes with HTML tags, we can also use JavaScript to set cache.
By using the browser's localStorage or sessionStorage object, we can store and read data to achieve the effect of caching.
The following is an example of using localStorage to set a key-value pair and get the value from it:
<script>
// 设置缓存
localStorage.setItem("key", "value");
// 获取缓存
var value = localStorage.getItem("key");
console.log(value); // 输出"value"
</script>Summary
By setting up cache, we can effectively improve the loading of web pages Speed and user experience. In HTML, we can implement caching by setting HTTP response headers, using HTML tags and JavaScript. By choosing appropriate methods and attributes, caching strategies can be customized according to different scenarios and needs.
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