Example 2: Replacing a substring within a string // Replaces old characters with new characters in a stringfunctionreplaceString(oldChars, newChars, string){for(leti =0; i < string.length; ++i) { if(string.substring(i, i + oldChars.length) == oldChars) { string = string.substring(0...
packagecom.example;publicclassMyClass{publicstaticvoidmain(String[]args){String test="Hello World !";String subTest1=test.substring(0,3);System.out.println("subTest:"+subTest1);String subTest2=test.substring(0,test.length());System.out.println("subTest:"+subTest2);}} 运行结果如下: 代...
JavaScript console.log() Javascript String substring() JavaScript String codePointAt() JavaScript String charAt() Javascript String toUpperCase() JavaScript StringThe JavaScript string is a primitive data type that represents textual data. For example, let name = "John"; Create JavaScript Strings...
varstr='abcd9999';varnewStr=str.slice(2);console.log(newStr);// 输出 cd9999;newStr=str.slice(-2);console.log(newStr);// 输出 99;newStr=str.slice(2,4);console.log(newStr);// 输出 cd;newStr=str.slice(2,-2);console.log(newStr);// 输出 cd99; 二、使用substring()截取 substri...
string.substring(0); console.log(substring); //substring method example //StartIndex and EndIndex are equal var substring = string.substring(0,0); //"" //StartIndex is greater than endIndex var substring = string.substring(9,0); //Nothing but string.substring(0,9); //substrin...
string. Thissubstringfunction can accept two numbers, thestartand theend(exclusive) character position, respectively. In case the end value is smaller than the start, substring is smart enough toswapthe values before doing the string extraction. An example of substring is illustrated in this code ...
constmyString="Hello, world!";constmySubstring=myString.substr(7,5);console.log(mySubstring);//...
package com.example;public class MyClass {public static void main(String[] args){String test = "Hello World !";String subTest1 = test.substring(0,3);System.out.println("subTest:" + subTest1);String subTest2 = test.substring(0,test.length());System.out.println("subTest:" + subTest...
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 ...
1:String.charAt(index) Tip:返回字符串指定位置的字符,index 为必须参数,类型为number(0到str.length-1之间,否则该方法返回 空串)另外:str.charAt()即不带参数和str.charAt(NaN)均返回字符串的第一个字符"; forexample: testString(){ let str= "z0a1b2c3d4e5f6h7g8k9X7Y8J";//index 1console.log(...