HTML and JavaScript are two very important technologies in web development. HTML is responsible for the structure and content of web pages, while JavaScript is used to enhance the interactivity and dynamics of web pages. In actual development, we often need to convert HTML code into JavaScript code so that we can use it in the application. Below, I will introduce a variety of methods to convert HTML code into JavaScript code.

1. Use innerHTML

innerHTML is a very practical attribute in JavaScript, which can insert HTML code into an element. For example, we can define an HTML element in a web page and set its innerHTML attribute to the HTML code that needs to be converted. Then, use JavaScript to get the innerHTML attribute value of the element to get the corresponding JavaScript code.

For example, we need to convert the following HTML code into JavaScript code:

  
这是一个标题
  
这是一段文字

We can define an element in HTML and set its innerHTML attribute to the HTML code that needs to be converted, as follows :

  
这是一个标题
  
这是一段文字

Then, obtain the innerHTML attribute value of the element in JavaScript, as follows:

var html = document.getElementById("myHtml").innerHTML;

At this time, the content in the variable html is the converted JavaScript code.

2. Use regular expressions

In JavaScript, we can use the matching function of regular expressions to extract various tags, attribute values, etc. in the HTML code, and then use them according to specific The format is spliced ​​into JavaScript code.

For example, we need to convert the following HTML code into JavaScript code:

  
这是一个标题
  
这是一段文字

We can use regular expressions to extract the tags, attribute values, etc., as follows:

var html = '
这是一个标题
这是一段文字
';
var tagsRegex = /(<(w+)>)/ig;
var attributesRegex = /([w-]+="[^"]*")/ig;

// 提取标签
html = html.replace(tagsRegex, function(match, p1) {
  return ''' + p1 + '',';  
});

// 提取属性值
html = html.replace(attributesRegex, function(match, p1) {
  return ''' + p1 + '',';  
});

console.log('createElement(' + html + ');');

In the above code, we use two regular expressions to extract tags and attribute values. Then, we use the replace method of the string to replace the matched content into the format we need.

3. Use template strings

In ES6, we can use template strings to splice strings. Template string supports variable interpolation, multi-line text and other functions, which is very practical.

For example, we need to convert the following HTML code into JavaScript code:

  
这是一个标题
  
这是一段文字

We can directly use the template string to splice it into the corresponding JavaScript code, as follows:

const html = `
  

    
这是一个标题
    
这是一段文字
  
`;

const js = `var div = document.createElement('div');
div.innerHTML = '${html}';
document.body.appendChild(div);`;

In the above code, we use backticks (`) to define the template string. Then, we can use ${} to insert variables and splice out the JavaScript code we need.

In short, HTML and JavaScript are very important technologies in web development. Mastering the method of converting HTML into JavaScript code can help us develop applications more conveniently. The above are several methods for converting HTML code into JavaScript code. You can choose one or more of them according to your actual situation.

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