50. 数值和字符串操作
var price = 10;
var count = 5;
var totalPrice = price * count; // should be 50
51. 数值和字符串操作
var price = 10;
var count = 5;
var totalPrice = price * count; // should be 50
var myPetName = 'Alice';
var somethingToSay = 'I love my pet ' +
myPetName + '.';
// should be I love my pet Alice.
52. 注意
var value1 = 1 + 2; // will be number 3
var value2 = '1' + '2'; // will be string '12'