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javascript基础
电动机的博客
Original
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总结：

1、JavaScript与html的嵌入方式：head内部、body内联、外部引入后缀点js;

2、变量的声明 关键字var  let/const;

3、数据类型：字符串、数字、布尔、数组、对象、NULL、undefined；

4、算数运算符：/、*、+、-、%、++、--;

5、赋值运算符：=、+=、-=、%=、/=;

6、比较运算符：==、===、！=、>、<、>=、<=;

7、逻辑运算符：&&（并且）、||（或者）、！（取反）

8、条件语句 if(  ){  };  if(){   }else{ }; if(){  }else if(){ }else{};

实例

<!DOCTYPE html>
<html>
<head>
	<title>javascript 第一节课</title>
</head>
<body>
  <script type="text/javascript">
  	// 成绩分类
  	var grate=89;
  	if (grate>=90) {
  		alert('成绩优秀！');
  	}else if (grate>=80) {
  		alert('成绩不错！');
  	}else if (grate>=60) {
  		alert('成绩合格！');
  	}else{
  		alert('成绩不合格，请继续努力！');
  	}
  	// 闰年
    var  year=2000;
    if (year%4 !=0) {
    	alert('不是闰年');
    }else if (year%100 !=0) {
    	alert('不是闰年');
    }else{
    	alert('是世纪闰年');
    }

  </script>
</body>
</html>

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Correction status：qualified

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