How does jquery determine how many characters a string can have?

Method: 1. Use the split() method to split the string into a character array. One character of the string corresponds to one element of the array. The syntax is "String element object.split("");"; 2. Use the length attribute to obtain the length of the character array, that is, the number of characters. The syntax is "array object.length;".

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

How jquery determines how many characters a string can have

In jquery, you can use the split() method to split a string into Array, and then use the length attribute to obtain the length of the string. The following example explains how jquery counts the number of characters.

The example is as follows:

1. Create a new html file, named test.html, to explain how jquery counts the number of strings. Use the input tag to create a text box for string input. Use the button tag to create a button with the name "Count the number of characters". Bind the onclick click event to the button button. When the button is clicked, the count() function is executed.

2. In the js tag, create the coupon() function. Within the function, obtain the element object through input, and use the val() method to obtain the characters entered in the text box. String, then use the split() method to split the string by null characters, and save the split array in the arr variable.

In the count() function, obtain the number of elements of the arr array through the length attribute, and finally, use the alert() method to output the number.

Open the test.html file in the browser, enter the string, click the button to see the effect.

Summary:

1. Create a test.html file.

2. In the file, use the input tag to create a text box and a button button to trigger the execution of the js function.

3. Create a function in the js tag. Within the function, obtain the element object through input, use the val() method to obtain the string entered in the text box, and then use the split() method to split the string. Divided into arrays, the number of strings can be obtained through the length attribute.

Recommended related video tutorials: jQuery video tutorial

The above is the detailed content of How does jquery determine how many characters a string can have?. For more information, please follow other related articles on the PHP Chinese website!