string

1 string format

let name = 'Jason';

let age = 20;

let str = 'My name is ' + name + ', I am ' + age + ' years old!'

console.log(str);

console.log(My name is ${name}, I am ${age} years old!);

2 string many lines and length

let text = 'This is very long line, \

it is 1000 lines.

console.log(text);

console.log(text.length);

3 position of a string

let name = 'Jason';

console.log(name.charAt(2));

4 string concat

let name = 'Jason';

console.log(name.concat(" is 20 years old."));

5 string search

let name = 'Jason' + " is 20 years old.";

let search1 = "is";

let search2 = "23";

console.log(name.includes(search1));

console.log(name.includes(search2));

6 string index

let name = 'Jason' + " is 20 years old.";

let search1 = "is";

let search2 = "23";

console.log(name.indexOf(search1, 20));

console.log(name.indexOf(search2));

7 substring

let content = 'Jason' + " is 20 years old.";

console.log(content.substring(1, 3));

console.log(content.substr(1, 3)); // start char, number of char

console.log(content.slice(1, 3));

8 modify string

let content = 'Jason' + " is 20 years old.";

console.log(content.toUpperCase());

console.log(content.toLowerCase());

9 split

let content = "This is a book";

console.log(content.split(" "));

10 replace

let content = "This is a book";

console.log(content.replace("book", "cat"));

标签：console,log,name,十种,JS,content,let,string
来源： https://blog.csdn.net/weixin_43012796/article/details/111056697