JS --- ``反单引号

<script type="text/javascript"> 
       var str = 
             `
               床前明月光,
               疑是地上霜,
               举头望明月,
              低头思故乡`;
        console.log(str);

        var a = "小明";
    console.log(`你好，${a}，很高兴见到你 `);
</script>