得到的字符串,"HELLO WORLD", 被赋值给变量upperStr. Javascript conststr ="hello world";constupperStr = str.toUpperCase();console.log(upperStr);// Output: "HELLO WORLD" 输出 HELLO WORLD 注:amanv09
In JavaScript string or character is to be converted into uppercase using str.toUpperCase() method this is used for converting entire strings into the Upper case format. Whenever we used toUpperCase() method the return value is to be string format and has converted into the uppercase the value...
JavaScript provides several built-in methods for manipulating strings, including one calledtoUpperCase()which can be used to convert the first letter of a string to uppercase. Here is an example of how to use thetoUpperCase()method to make the first letter of a string uppercase: ...
#Check if the First Letter of a String is Uppercase in JavaScript To check if the first letter of a string is uppercase: Use theString.charAt()method to get the first letter of the string. Use theString.toUppercase()method to convert the letter to uppercase. ...
toUpperCase() Method The toUpperCase() method transforms a string into uppercase letters in JavaScript. It doesn't change the original string and returns a new string equivalent to the string converted to uppercase. Here is an example: const str = 'JavaScript World!' // convert string to upp...
JavaScript comes bundled with a string method called toUpperCase, which could be used to capitalize the whole string. However, it does not provide a method that could capitalize only the first letter of a specific string. In this article, we'll learn to build a functionality that could capital...
return this.charAt(0).toUpperCase() + this.slice(1); } And then: "hello world".capitalize(); => "Hello world" 在CSS中: p:first-letter { text-transform:capitalize; } 链接地址:http://www.djcxy.com/p/372.html 如何在JavaScript中制作字符串大写的第一个字母?
We used the String.toUpperCase() method to convert each string in the array to uppercase. The Array.map() method returns a new array, it doesn't change the original array. Alternatively, you can use the Array.forEach() method.
In JavaScript there is no shortcut function like the PHP ucfirst() to make the first letter or character of a string to uppercase. However, you can achieve the same thing using the JavaScript toUpperCase() method in combination with the charAt() and slice() methods with a little trick....
To convert all elements in an array to lowercase, you can use another JavaScript method calledString.toLowerCase()as shown below: constnames=['Ali','Atta','Alex','John'];constlowercased=names.map(name=>name.toLowerCase());console.log(lowercased);// ['ali', 'atta', 'alex', 'john...