<script>
                let num = 10
                // 用户购买货物花费$10
                console.log('用户购买货物花费$'+num)

                // 思思今年26岁
                let uname ='思思'
                let age = 26
                console.log(uname+'今年'+age+'岁')
                console.log(uname+'今年'+age+'岁')

                // 模版字符串 反引号，${变量}
                document.write(`
                ${uname}
                今年
                ${age}
                岁
                `)
            </script>