jquery deletes the last byte

jQuery is a front-end development framework based on JavaScript language and is widely used in web development. During development, we often need to use jQuery to remove the last byte of a string. Next, this article will introduce how to use jQuery to achieve this function.

1. Use the substring method to delete the last byte

jQuery provides a variety of methods to delete the last byte of a string. The simplest method is to use the substring() method. . This method deletes a specified number of characters from a string. The number of characters to be deleted can be calculated based on the length of the string.

The specific implementation steps are as follows:

1. Get the length of the string:

   var str = "hello world!";
   var len = str.length;

2. Get the number of characters to be deleted:

   var n = 1;//Delete one byte

3. Use the substring() method to delete the last character.

   var newStr = str.substring(0,len-n);

   console.log(newStr);
   //The output result is "hello world"

2. Use regular expressions to delete the last byte

In addition to using the substring method, we can also use regular expressions to delete the last byte.

The specific implementation steps are as follows:

1. Define the regular expression to match the last byte:

   var reg = /.$/;

In regular expressions, "$" indicates the end of the matching string, and any character before $ will be matched.

2. Use the replace() method to replace the last byte with an empty string:

   var str = "hello world!";
   var newStr = str .replace(reg,"");//Replace the last character with an empty string

console.log(newStr);
//The output result is "hello world ”

3. Use the slice() method to delete the last byte

Another method provided by jQuery to delete the last byte is to use the slice() method. This method can intercept a continuous character from a string. The first parameter indicates the starting position of interception, and the second parameter indicates the ending position of interception. If the second parameter is not specified, it will be intercepted from the beginning to the end of the string.

The specific implementation steps are as follows:

1. Intercept all characters except the last byte:

var str = "hello world!";
var len = str.length;
var newStr = str.slice(0, len-1);

console.log(newStr);
//The output result is "hello world"

2. Intercept the last byte:

var str = "hello world!";
var len = str.length;
var lastByte = str.slice( len-1);

console.log(lastByte);
//The output result is "!"

In summary, use jQuery to delete the last byte of the string There are many ways, the most common of which are using substring, regular expressions and slice methods. Developers can choose the appropriate method based on their own needs and habits. At the same time, it should be noted that when using these methods, you should ensure that the string is not empty, otherwise unpredictable errors will occur.

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