And based on that, it will return the part of the string between indexes. If only the start index is provided, it will return the end of the string.Syntax:substring(indexStart); substring(indexStart, indexEnd); Any character present within the start and end index (including start char ...
The first character of a string has an index of 0, and the last has an index of str.length - 1. Get the last character of a string using bracket notation You can also use the bracket notation ([]) to get the last character of a string: const str = 'JavaScript' const lastChar =...
var points = x * 10; // Number 通过表达式字面量赋值 var lastName = "Johnson"; // String 通过字符串字面量赋值 var cars = ["Saab", "Volvo", "BMW"]; // Array 通过数组字面量赋值 var person = {firstName:"John", lastName:"Doe"}; // Object 通过对象字面量赋值 数据类型的概念 编...
functiongetZFWlength(string) { varcount=0; for(vari=0;i<string.length;i++) { //对每一位字符串进行判断,如果Unicode编码在0-127,计数器+1;否则+2 if(string.charCodeAt(i)<128&&string.charCodeAt(i)>=0) { count++; }else{ count+=2; } } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10....
一些js原生的方法会返回null,比如string.prototypt.match() 参数不是对象时,会返回null,来表示对象缺失。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 letarray=null;array;// => nulllet movie = { name: 'Starship Troopers', musicBy: null };movie.musicBy; // => null'abc'.match(/[0-9...
"string"==typeof e?i.call(S(e),this[0]):i.call(this,e.jquery?e[0]:e):this[0]&&this[0].parentNode?this.first().prevAll().length:-1},add:function(e,t){return this.pushStack(S.uniqueSort(S.merge(this.get(),S(e,t)))},addBack:function(e){return this.add(null==e?this....
node.appendChild(textnode);document.getElementById('products 2').appendChild(node); }// create function objects for each type of coffeevarcolumbian =function(){this.name='columbian';this.basePrice=5; };varfrenchRoast =function(){this.name='french roast';this.basePrice=8; ...
The "subStrAfterChars()" function takes three parameters: 'str' (the input string), 'char' (the character to search for), and 'pos' (the position indicator). Inside the function, it checks the value of the 'pos 'parameter: If 'pos' is 'b' (before), it returns the substring after...
let str = `Hello`;// the first characteralert( str[0] ); // Halert( str.charAt(0) ); // H// the last characteralert( str[str.length - 1] ); // o 也可以使用for of语句来迭代字符串 for (let char of "Hello") {alert(char); // H,e,l,l,o (char becomes "H", then "...
jsClass; private string? result; protected override void OnInitialized() => jsClass = new(JS); private async Task SetStock() { if (jsClass is not null) { stockSymbol = $"{(char)('A' + Random.Shared.Next(0, 26))}" + $"{(char)('A' + Random.Shared.Next(0, 26))}"; ...