How does jquery determine how many characters a string can have?
This article introduces the knowledge of "how to judge how many characters a string can have". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
Methods: 1, use the split () method to divide the string into an array of characters, a character of the string corresponds to an 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 does jquery determine how many characters a string can have?
In jquery, you can use the split () method to split a string into an array, and then use the length property implementation to get the length of the string. Here is an example of how jquery calculates the number of characters.
Examples are as follows:
1. Create a new html file, named test.html, to explain how jquery calculates 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 characters". Bind the onclick click event to the button button, and execute the counum () function when the button is clicked.
2, in the js tag, create the counum () function, within the function, get the element object through input, use the val () method to get the string input in the text box, and then use the split () method to segment the string according to empty characters, and save the split array in the arr variable.
Within the counum () function, the number of elements of the arr array is obtained through the length attribute, and finally, the number is output using the alert () method.
Open the test.html file in the browser, enter the string, and click the button to see the effect of the implementation.
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