JavaScript数据类型

/**
 * Created by Jeco on 2018/11/27.
 */

var a
a = ‘a‘
console.log(typeof (a))
console.log(a)

var num1 =10;
var num2=10;
var sum = num1 + num2 ;
//把sum自动转换成字符串做拼接
console.log("sum =" +sum)

================================================================

var a
a = ‘a‘
console.log(typeof (a))
console.log(a)

var num1 =10;
var num2=10;
var sum = num1 + num2 ;
console.log("sum =" +sum)

var num3 = Infinity-1
var num4= NaN
console.log(num3)

var a =‘123‘
var num5=parseInt(a)

JavaScript数据类型

原文：https://www.cnblogs.com/jeco-li/p/10035532.html