二 JavaScript基础之ECMAScript 模版字符串javascript初认识之模版字符串通过三个小案例展示

模版字符串

  `${变量名}`

案例一

 let age = prompt('请输入姓名：')
 let name =prompt('请输入年龄')
 document.write(`大家好，我叫${name},今年${age}岁了`)

案例二

显式转换 Number或+

  let firstNum = Number(prompt('请输入第一个数字'))
  let secondNum = Number(prompt('请输入第二个数字'))
  let result = firstNum * secondNum
  document.write(`两个数相加的和是${firstNum+secondNum}`) 
  
  let num1 = +prompt('请输入第一个数字')
  let num2 = +prompt('请输入第二个数字')
  document.write(`两个数字相加的和是：${num1+num2}`)

案例三

 <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
       h2{
        text-align: center;
       }
       table{
        border-collapse: collapse;
        text-align: center;
       }
       th{
        padding: 5px 30px;
       }
       table,th,td{
        margin: 0 auto;
        border: 1px solid #000;
       }
    </style>
</head>
<body>
    <h2>订单确认</h2>
<script>
      let price = +prompt('请输入商品价格')
      let num = +prompt('请输入商品数量')
      let address = prompt('请输入收货地址')
      let total = price * num
      document.write(`
      <table>
        <tr>
            <th>商品名称</th>
            <th>商品价格</th>
            <th>商品数量</th>
            <th>总价</th>
            <th>收货地址</th>
        </tr>
        <tr>
            <td>小米青春PLUS</td>
            <td>${price}</td>
            <td>${num}元</td>
            <td>${total}元</td>
            <td>${address}</td>
        </tr>
    </table>
      `)
  </script>
</body>
</html>