JavaScript 字符串和数字转换

JavaScript 字符串和数字转换

javascript
var str = '123';
var num = parseInt(str);
console.log(num);  // 输出：123

javascript
var str = '3.14';
var num = parseFloat(str);
console.log(num);  // 输出：3.14

javascript
var num = 123;
var str = num.toString();
console.log(str);  // 输出："123"

javascript
var num = 3.14;
var str = '' + num;
console.log(str);  // 输出："3.14"

javascript
var name = 'Alice';
var age = 25;
var message = `My name is ${name} and I am ${age} years old.`;
console.log(message);  // 输出："My name is Alice and I am 25 years old."