可以使用String作为toString()更可靠的代替方法,因为它在用于null和undefined时仍然有效。例如: js constnullVar=null;nullVar.toString();// TypeError: nullVar is nullString(nullVar);// "null"constundefinedVar=undefined;undefinedVar.toString();// TypeError: undefinedVar is undefinedString(undefinedVar);/...
JavaScript counts positions from zero.0 is the first position in a string, 1 is the second, 2 is the third ...Both methods accept a second parameter as the starting position for the search.Searching for a String in a StringThe search() method searches a string for a specified value and...
JavaScript String() ❮PreviousJavaScriptGlobal MethodsNext❯ Examples Convert different values to strings: String(newDate()); String("12345"); String(12345); Try it Yourself » Description TheString()method converts a value to a string....
This JavaScript tutorial explains how to use the string method called substr() with syntax and examples. In JavaScript, substr() is a string method that is used to extract a substring from a string, given a start position and a length.
The charCodeAt() method does not change the value of the originalstring. Example Let's take a look at an example of how to use the charCodeAt() method in JavaScript. For example: vartotn_string='TechOnTheNet';console.log(totn_string.charCodeAt(0));console.log(totn_string.charCodeAt(1)...
Thesubstring()method does not change the original string. If start is greater than end, arguments are swapped: (4, 1) = (1, 4). Start or end values less than 0, are treated as 0. See Also: The split() Method The slice() Method ...
Note:This method is case sensitive. Syntax String.find(sub_string[, start_index[, end_index]]) Parameters sub_string- a part of the string to be found in the string. start_index- an optional parameter, it defines the starting index from where sub_string should be found. ...
JavaScript - Mixins JavaScript - Proxies htmlheadtitleJavaScript StringMethodtitleheadbodyconststr="JavaScript";document.write("String: ",str);document.write("The second last element using at(-2) method: ",str.at(-2));document.write("The second last element using charAt(str.length-2) method...
String 的 substring() 方法返回该字符串从起始索引到结束索引(不包括)的部分,如果未提供结束索引,则返回到字符串末尾的部分。
console.log(result);// Output: JavaScript substring() Syntax The syntax of thesubstring()method is: str.substring(indexStart, indexEnd) Here,stris a string. substring() Parameters Thesubstring()method takes in: indexStart- The index of the first character to start including in the returned ...