


Share the 55 most commonly used classic tips in Javascript_javascript tips
1. oncontextmenu="window.event.returnValue=false" will completely block the right mouse button
no |
2.
Cancel selection and prevent copying3. onpaste="return false" No pasting allowed
4. oncopy="return false;" oncut="return false;" Prevent copying
5. Replace the IE address bar with your own icon
6. can display your icon in favorites
7. Turn off input method
8. Always carry frames
9. Prevent being framed
10. Web pages will not be saved as
11.
12. Confirm when deleting
Delete
13. Get the absolute position of the control
//Javascript
//VBScript
14. The cursor is stopped at the end of the text box text
15. 判断上一页的来源
javascript :
document.referrer
16. 最小化、最大化、关闭窗口
本例适用于IE
17.屏蔽功能键Shift,Alt,Ctrl
<script><BR>function look(){ <BR>if(event.shiftKey) <BR>alert("禁止按Shift键!"); //可以换成ALT CTRL<BR>} <BR>document.onkeydown=look; <BR></script>
18. 网页不会被缓存
或者
19.怎样让表单没有凹凸感?
或
20.
用来定义同一行内的元素,跟
21.让弹出窗口总是在最上面:
22.不要滚动条?
让竖条没有:
让横条没有:
两个都去掉?更简单了
24.电子邮件处理提交表单
25.在打开的子窗口刷新父窗口的代码里如何写?
window.opener.location.reload()
26.如何设定打开页面的大小
打开页面的位置
27.在页面中如何加入不是满铺的背景图片,拉动页面时背景图不动
28. 检查一段字符串是否全由数字组成
29. 获得一个窗口的大小
document.body.clientWidth; document.body.clientHeight
30. 怎么判断是否是字符
if (/[^/x00-/xff]/g.test(s)) alert("含有汉字");
else alert("全是字符");
31.TEXTAREA自适应文字行数的多少
32. 日期减去天数等于第二个日期
33. 选择了哪一个Radio
Style
Barcode
34.脚本永不出错
35.ENTER键可以让光标移到下一个输入框
36. 检测某个网站的链接速度:
把如下代码加入
37. 各种样式的光标
auto :标准光标
default :标准箭头
hand :手形光标
wait :等待光标
text :I形光标
vertical-text :水平I形光标
no-drop :不可拖动光标
not-allowed :无效光标
help :?帮助光标
all-scroll :三角方向标
move :移动标
crosshair :十字标
e-resize
n-resize
nw-resize
w-resize
s-resize
se-resize
sw-resize
38.页面进入和退出的特效
进入页面
推出页面
这个是页面被载入和调出时的一些特效。duration表示特效的持续时间,以秒为单位。transition表示使用哪种特效,取值为1-23:
0 矩形缩小
1 矩形扩大
2 圆形缩小
3 圆形扩大
4 下到上刷新
5 上到下刷新
6 左到右刷新
7 右到左刷新
8 竖百叶窗
9 横百叶窗
10 错位横百叶窗
11 错位竖百叶窗
12 点扩散
13 左右到中间刷新
14 中间到左右刷新
15 中间到上下
16 上下到中间
17 右下到左上
18 右上到左下
19 左上到右下
20 左下到右上
21 横条
22 竖条
23 以上22种随机选择一种
39.在规定时间内跳转
40.网页是否被检索
其中属性值有以下一些:
属性值为"all": 文件将被检索,且页上链接可被查询;
属性值为"none": 文件不被检索,而且不查询页上的链接;
属性值为"index": 文件将被检索;
属性值为"follow": 查询页上的链接;
属性值为"noindex": 文件不检索,但可被查询链接;
属性值为"nofollow": 文件不被检索,但可查询页上的链接。
41、email地址的分割
把如下代码加入
webmaster@sina.com
42、流动边框效果的表格
把如下代码加入
<script><BR>l=Array(6,7,8,9,'a','b','b','c','d','e','f')<BR>Nx=5;Ny=35<BR>t="<table border=0 cellspacing=0 cellpadding=0 height=" ((Nx 2)*16) "><tr>"<BR>for(x=Nx;x<Nx Ny;x )<BR>t ="<td width=16 id=a_mo" x "> "<BR>t ="<tr><td width=10 id=a_mo" (Nx-1) "> <td colspan=" (Ny-2) " rowspan=" (Nx) "> <td width=16 id=a_mo" (Nx Ny) ">"<BR>for(x=2;x<=Nx;x )<BR>t ="<tr><td width=16 id=a_mo" (Nx-x) "> <td width=16 id=a_mo" (Ny Nx x-1) "> "<BR>t ="<tr>"<BR>for(x=Ny;x>0;x--)<BR>t ="<td width=16 id=a_mo" (x Nx*2 Ny-1) "> "<BR>***(t "")<BR>var N=Nx*2 Ny*2<BR>function f1(y){<BR>for(i=0;i<N;i ){<BR>c=(i y) ;if(c>10)c=20-c<BR>document.all["a_mo" (i)].bgColor=""""#0000" l[c] l[c] "'"}<BR>y <BR>setTimeout('f1(' y ')','1')}<BR>f1(1)<BR></script>
43、JavaScript主页弹出窗口技巧
窗口中间弹出
<script><BR>window.open("http://www.jb51.net","","width=400,height=240,top=" (screen.availHeight-240)/2 ",left=" (screen.availWidth-400)/2);<BR></script>
============
==============
一、在下面的代码中,你只要单击打开一个窗口,即可链接到赛迪网。而当你想关闭时,只要单击一下即可关闭刚才打开的窗口。
代码如下:
二、上面的代码也太静了,为何不来点动感呢?如果能给页面来个降落效果那该多好啊!
代码如下:
<script> <BR> function drop(n) { <BR> if(self.moveBy){ <BR> self.moveBy (0,-900); <BR> for(i = n; i > 0; i--){ <BR> self.moveBy(0,3); <BR> } <BR> for(j = 8; j > 0; j--){ <BR> self.moveBy(0,j); <BR> self.moveBy(j,0); <BR> self.moveBy(0,-j); <BR> self.moveBy(-j,0); <BR> } <BR> } <BR> } <BR> </script>
3. I hate that many websites always open in the default window. It would be great if you could control the opened window as you wish.
The code is as follows:
First frame | Second frame | Third frame | > ;

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing


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