3710人加入学习
(6人评价)
Web前端第三季(JavaScript)

制作完成于2018年6月14日

价格 免费

 <script type="text/javascript" >
  var stringl="好好学习,天天向上"
  function:myname{
   console.log("第一步");
   console.log("第二部");
   console.log("第三部");
  }
  myname();
  myname();
//  alert(stringl);
//  alert(stringl);
 </script>

[展开全文]
<p>用var定义的变量</p>
<p>1.可以数字相加</p>
<p>2.可以字符串拼接</p>
<p>3.可以字符串number类型随意拼接</p>
<p>例</p>
 <script type="text/jscript" >
 var b="好好学习,天天向上";
 var a=1;var b=2;
 var c="siki"+"100"+"2";
 var d=1+2;
 var f='k';
 console.log(a+b);
 console.log(a+b+c);  
 console.log(c);
 console.log(typeof(c));
 console.log(d);    
 console.log(typeof(d));    number
 console.log(typeof(f));     string
 </script>
[展开全文]

js

1.变量必须以字母开头、

2.变量也能以$和_符号开头(不推荐)

3.变量名称对大小写敏感(y和Y)是不同变量

4.不推荐使用关键字

 

function 

[展开全文]

(pc,客户端)跨平台,非编程语言,是脚本语言。

 

[展开全文]

Dom:  Document  Object  Model

                文档         对象      模型

[展开全文]

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ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggshfghhgfgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg

[展开全文]
<script type="text/javascript">
		var s="好好学习,天天向上"
	    alert(s);
		alert(s);
	    alert(s);
	

 

[展开全文]

alert(typeof("类型"))

typeof:可判断数据类型

 

 

布尔 boolean true false

数组 number

数组 array

对象 object

空 null

未定义 

[展开全文]

字符串:

字符串可以为单引号也可以为双引号;

单引号需要嵌套在双引号里面," ' ' "

[展开全文]

alert 其实就是一个函数。

alert 是浏览器本有的函数。

[展开全文]

js脚本:

1.行内引入 

<font  onclick= alert('你点击了我');alert('哈哈');>你好</font>

2.外部引入

<script  type="text/javaScript" src=""></script> 

3.内部引入

<script  type="text/javaScript">alert(”hello“);</script>

 

无论是head标签,body都可以嵌入。

 

单行//

多行/**/

[展开全文]

变量必须以字母来头

$ 和_符号开头

大小写变量要求(a和 A)

不能使用关键字

 

 

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var score  ;

score=10;

alert(score);

 

 

 

var score=10;

alert(score);

score =“siki”

alert(score);

 

var 

 

 

 

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\\=\

\''='

\""="

alert 弹框

布尔 boolearn

数组 arrary

对象 object

空 null

未定义 undefine

alert(typeof(数值类型))

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  • var p4=/[1234]/;  []表示其中任意一个;或的关系 
  • var p5=/\d/;  表示数字[0-9]
  • 正整数 var p6=/^[1-9]\d*$/
  • var p7=/a*/  表示a有一个或者多个
  •  
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判断一个字符串是否符合正则表达式

test();

var p1=/^a/   以a开头

var p2=/a$/   以b结尾

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