• 前端入门学习笔记三十四

    1. html>
    2. <html>
    3. 	<head>
    4. 		<meta charset = "UTF-8"/>
    5. 		<title>title>
    6. 	head>
    7. 	<body>
    8. 		<p>JavaScript 运算符p>
    9. 		<h3>HTMLh3>
    10. 		<p id = "demo">p>
    11. 		<script>
    12. 			document.getElementById("demo").innerHTML = (10 + 9) * 3;
    13. 		script>
    14. 	body>
    15. html>

    JavaScript 运算符
    JavaScript 使用算数运算符（+ - * /）来计算值

    1. html>
    2. <html>
    3. 	<head>
    4. 		<meta charset = "UTF-8"/>
    5. 		<title>title>
    6. 	head>
    7. 	<body>
    8. 		<p>JavaScript 使用赋值运算符htmlp>
    9. 		<h3>html
    10. 		<p id = "demo2">p>
    11. 		<p id = "demo3">p>
    12. 		<script>
    13. 			var y,k;
    14. 			 y = 10;
    15. 			 k = 9;
    16. 			document.getElementById("demo2").innerHTML =  k + y;
    17. 		script>
    18. 	body>
    19. html>

    JavaScript 使用赋值运算符（=）向变量赋值 

    1. html>
    2. <html>
    3. 	<head>
    4. 		<meta charset = "UTF-8"/>
    5. 		<title>title>
    6. 	head>
    7. 	<body>
    8. 		<p>JavaScript 表达式p>
    9. 		<h3>JavaScript 表达式h3>
    10. 		<p id = "demo3">p>
    11. 		<script>
    12. 			document.getElementById("demo3").innerHTML = 3 * 10;
    13. 		script>
    14. 	body>
    15. html>

    JavaScript 表达式
    表达式是值、变量和运算符的组合，计算结果是值 

    1. html>
    2. <html>
    3. 	<head>
    4. 		<meta charset = "UTF-8"/>
    5. 		<title>title>
    6. 	head>
    7. 	<body>
    8. 		<p>JavaScript 表达式p>
    9. 		<h3>JavaScript 表达式h3>
    10. 		<p id = "demo5">p>
    11. 		<script>
    12. 			var v;
    13. 			v = 100;
    14. 			document.getElementById("demo5").innerHTML = v * 10;
    15. 		script>
    16. 	body>
    17. html>

    JavaScript 表达式
    表达式也可包含变量值

    1. html>
    2. <html>
    3. 	<head>
    4. 		<meta charset = "UTF-8"/>
    5. 		<title>title>
    6. 	head>
    7. 	<body>
    8. 		<p>JavaScript 表达式p>
    9. 		<h3>JavaScript 表达式h3>
    10. 		<p id = "demo9">p>
    11. 		<script>
    12. 			document.getElementById("demo9").innerHTML = "HTML" + "" +"css"
    13. 		script>
    14. 	body>
    15. html>

    JavaScript 表达式
    值可以是多种类型，比如数值和字符串。

    1. html>
    2. <html>
    3. 	<head>
    4. 		<meta charset = "UTF-8"/>
    5. 		<title>title>
    6. 	head>
    7. 	<body>
    8. 		<p>p>
    9. 		<h3>h3>
    10. 		<p id = "demo0">p>
    11. 		<p id = "demo10">p>
    12. 		<script>
    13. 			var h,q;
    14. 			h = 9 * 10;
    15. 			q = h * 10;
    16. 			document.getElementById("demo0").innerHTML = h;
    17. 			document.getElementById("demo10").innerHTML = q;
    18. 		script>
    19. 	body>
    20. html>

    JavaScript 关键词
    JavaScript 关键词用于标识被执行的动作

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  • 原文地址：https://blog.csdn.net/m0_65384293/article/details/128178985