1、排查语法错误
<script> console.log(1; </script>
2、变量提升和函数整体提升
<script>
console.log(n1);
</script>
<script> console.log(n1); var n1 = 1; </script>
3、变量提升只提升变量名不提升变量的值
1、排查语法错误
<script> console.log(1; </script>
2、变量提升和函数整体提升
<script>
console.log(n1);
</script>
<script> console.log(n1); var n1 = 1; </script>
3、变量提升只提升变量名不提升变量的值