所谓查看源代码，就是别人服务器发送到浏览器的原封不动的代码。
审查元素时，你看到那些，在源代码中找不到的代码，是在浏览器执行js动态生成的。
通过审查元素看到的就是最终的html代码。即：源代码 + 网页js渲染 。
我们查看网页源代码平时使用的方式是
1、右击鼠标，点击查看网页源代码。
2、按F12、ctrl+u、ctrl+shift+I、ctrl+shift+c查看源代码。
3、按ctrl+s保存下来，看源代码
4、XXXXX
屏蔽掉右键、复制、选择的完整代码：
首先我们来解决鼠标右击事件，就是我们自己实现右击事件，并且在右击事件函数里什么都不做。这样就弹不出右击菜单了。
/**禁止右击事件菜单弹出*/
document.οncοntextmenu=ContextMenu;
function ContextMenu()
{
return false;
}
其次，我们禁止使用ctrl+s、ctrl+u、F12、ctrl+shift+I、ctrl+shift+c。代码如下：
/** 全局事件监听*/
document.body.onkeydown = function(e){
var keyCode = e.keyCode || e.which || e.charCode;
var ctrlKey = e.ctrlKey || e.metaKey;
if(ctrlKey && (keyCode == 83 || keyCode == 85 || keyCode == 73)) {
e.preventDefault();
return false;
}
else if(ctrlKey && (keyCode == 83 || keyCode == 85 || keyCode == 67)) {
e.preventDefault();
return false;
}else if(keyCode && keyCode == 123){
return false;
}
}
只要在你的初始化函数里加上上面的代码，那么你的页面就不能查看源代码了。当然只限于前三种方式。真正能实现源代码屏蔽的单纯的.html是不可能的!想看源代码也是没办法阻止的。此脚本这只能防止不劳而获的小白，针对计算机老鸟、大神是无法作用的；并且现在很多浏览器自带有查看网页源代码的功能。用TELEPROT 这类网站下载工具可以下载任何文件，相当于做镜像网站。想真正的保护源代码，除非服务器进行安全设置、加密。
js 里面的键盘事件经常用到的 记录一下
keyCode 8 = BackSpace BackSpace
keyCode 9 = Tab Tab
keyCode 12 = Clear
keyCode 13 = Enter
keyCode 16 = Shift_L
keyCode 17 = Control_L
keyCode 18 = Alt_L
keyCode 19 = Pause
keyCode 20 = Caps_Lock
keyCode 27 = Escape Escape
keyCode 32 = space
keyCode 33 = Prior
keyCode 34 = Next
keyCode 35 = End
keyCode 36 = Home
keyCode 37 = Left
keyCode 38 = Up
keyCode 39 = Right
keyCode 40 = Down
keyCode 41 = Select
keyCode 42 = Print
keyCode 43 = Execute
keyCode 45 = Insert
keyCode 46 = Delete
keyCode 47 = Help
keyCode 48 = 0 equal braceright
keyCode 49 = 1 exclam onesuperior
keyCode 50 = 2 quotedbl twosuperior
keyCode 51 = 3 section threesuperior
keyCode 52 = 4 dollar
keyCode 53 = 5 percent
keyCode 54 = 6 ampersand
keyCode 55 = 7 slash braceleft
keyCode 56 = 8 parenleft bracketleft
keyCode 57 = 9 parenright bracketright
keyCode 65 = a A
keyCode 66 = b B
keyCode 67 = c C
keyCode 68 = d D
keyCode 69 = e E EuroSign
keyCode 70 = f F
keyCode 71 = g G
keyCode 72 = h H
keyCode 73 = i I
keyCode 74 = j J
keyCode 75 = k K
keyCode 76 = l L
keyCode 77 = m M mu
keyCode 78 = n N
keyCode 79 = o O
keyCode 80 = p P
keyCode 81 = q Q at
keyCode 82 = r R
keyCode 83 = s S
keyCode 84 = t T
keyCode 85 = u U
keyCode 86 = v V
keyCode 87 = w W
keyCode 88 = x X
keyCode 89 = y Y
keyCode 90 = z Z
keyCode 96 = KP_0 KP_0
keyCode 97 = KP_1 KP_1
keyCode 98 = KP_2 KP_2
keyCode 99 = KP_3 KP_3
keyCode 100 = KP_4 KP_4
keyCode 101 = KP_5 KP_5
keyCode 102 = KP_6 KP_6
keyCode 103 = KP_7 KP_7
keyCode 104 = KP_8 KP_8
keyCode 105 = KP_9 KP_9
keyCode 106 = KP_Multiply KP_Multiply
keyCode 107 = KP_Add KP_Add
keyCode 108 = KP_Separator KP_Separator
keyCode 109 = KP_Subtract KP_Subtract
keyCode 110 = KP_Decimal KP_Decimal
keyCode 111 = KP_Divide KP_Divide
keyCode 112 = F1
keyCode 113 = F2
keyCode 114 = F3
keyCode 115 = F4
keyCode 116 = F5
keyCode 117 = F6
keyCode 118 = F7
keyCode 119 = F8
keyCode 120 = F9
keyCode 121 = F10
keyCode 122 = F11
keyCode 123 = F12
keyCode 124 = F13
keyCode 125 = F14
keyCode 126 = F15
keyCode 127 = F16
keyCode 128 = F17
keyCode 129 = F18
keyCode 130 = F19
keyCode 131 = F20
keyCode 132 = F21
keyCode 133 = F22
keyCode 134 = F23
keyCode 135 = F24
keyCode 136 = Num_Lock
keyCode 137 = Scroll_Lock
keyCode 187 = acute grave
keyCode 188 = comma semicolon
keyCode 189 = minus underscore
keyCode 190 = period colon
keyCode 192 = numbersign apostrophe
keyCode 210 = plusminus hyphen macron
keyCode 211 =
keyCode 212 = copyright registered
keyCode 213 = guillemotleft guillemotright
keyCode 214 = masculine ordfeminine
keyCode 215 = ae AE
keyCode 216 = cent yen
keyCode 217 = questiondown exclamdown
keyCode 218 = onequarter onehalf threequarters
keyCode 220 = less greater bar
keyCode 221 = plus asterisk asciitilde
keyCode 227 = multiply division
keyCode 228 = acircumflex Acircumflex
keyCode 229 = ecircumflex Ecircumflex
keyCode 230 = icircumflex Icircumflex
keyCode 231 = ocircumflex Ocircumflex
keyCode 232 = ucircumflex Ucircumflex
keyCode 233 = ntilde Ntilde
keyCode 234 = yacute Yacute
keyCode 235 = oslash Ooblique
keyCode 236 = aring Aring
keyCode 237 = ccedilla Ccedilla
keyCode 238 = thorn THORN
keyCode 239 = eth ETH
keyCode 240 = diaeresis cedilla currency
keyCode 241 = agrave Agrave atilde Atilde
keyCode 242 = egrave Egrave
keyCode 243 = igrave Igrave
keyCode 244 = ograve Ograve otilde Otilde
keyCode 245 = ugrave Ugrave
keyCode 246 = adiaeresis Adiaeresis
keyCode 247 = ediaeresis Ediaeresis
keyCode 248 = idiaeresis Idiaeresis
keyCode 249 = odiaeresis Odiaeresis
keyCode 250 = udiaeresis Udiaeresis
keyCode 251 = ssharp question backslash
keyCode 252 = asciicircum degree
keyCode 253 = 3 sterling
keyCode 254 = Mode_switch
使用event对象的keyCode属性判断输入的键值
eg：if(event.keyCode==13)alert(“enter!”);
键值对应表
A 0X65 U 0X85
B 0X66 V 0X86
C 0X67 W 0X87
D 0X68 X 0X88
E 0X69 Y 0X89
F 0X70 Z 0X90
G 0X71 0 0X48
H 0X72 1 0X49
I 0X73 2 0X50
J 0X74 3 0X51
K 0X75 4 0X52
L 0X76 5 0X53
M 0X77 6 0X54
N 0X78 7 0X55
O 0X79 8 0X56
P 0X80 9 0X57
Q 0X81 ESC 0X1B
R 0X82 CTRL 0X11
S 0X83 SHIFT 0X10
T 0X84 ENTER 0XD
Keycode常数表
可在代码中的任何地方用下列常数代替实际值：
常数 值 描述
vbKeyLButton 0x1 鼠标左键
vbKeyRButton 0x2 鼠标右键
vbKeyCancel 0x3 CANCEL 键
vbKeyMButton 0x4 鼠标中键
vbKeyBack 0x8 BACKSPACE 键
vbKeyTab 0x9 TAB 键
vbKeyClear 0xC CLEAR 键
vbKeyReturn 0xD ENTER 键
vbKeyShift 0x10 SHIFT 键
vbKeyControl 0x11 CTRL 键
vbKeyMenu 0x12 MENU 键
vbKeyPause 0x13 PAUSE 键
vbKeyCapital 0x14 CAPS LOCK 键
vbKeyEscape 0x1B ESC 键
vbKeySpace 0x20 SPACEBAR 键
vbKeyPageUp 0x21 PAGE UP 键
vbKeyPageDown 0x22 PAGE DOWN 键
vbKeyEnd 0x23 END 键
vbKeyHome 0x24 HOME 键
vbKeyLeft 0x25 LEFT ARROW 键
vbKeyUp 0x26 UP ARROW 键
vbKeyRight 0x27 RIGHT ARROW 键
vbKeyDown 0x28 DOWN ARROW 键
vbKeySelect 0x29 SELECT 键
vbKeyPrint 0x2A PRINT SCREEN 键
vbKeyExecute 0x2B EXECUTE 键
vbKeySnapshot 0x2C SNAPSHOT 键
vbKeyInsert 0x2D INSERT 键
vbKeyDelete 0x2E DELETE 键
vbKeyHelp 0x2F HELP 键
vbKeyNumlock 0x90 NUM LOCK 键
A 至 Z 键与 A – Z 字母的 ASCII 码相同：
常数 值 描述
vbKeyA 65 A 键
vbKeyB 66 B 键
vbKeyC 67 C 键
vbKeyD 68 D 键
vbKeyE 69 E 键
vbKeyF 70 F 键
vbKeyG 71 G 键
vbKeyH 72 H 键
vbKeyI 73 I 键
vbKeyJ 74 J 键
vbKeyK 75 K 键
vbKeyL 76 L 键
vbKeyM 77 M 键
vbKeyN 78 N 键
vbKeyO 79 O 键
vbKeyP 80 P 键
vbKeyQ 81 Q 键
vbKeyR 82 R 键
vbKeyS 83 S 键
vbKeyT 84 T 键
vbKeyU 85 U 键
vbKeyV 86 V 键
vbKeyW 87 W 键
vbKeyX 88 X 键
vbKeyY 89 Y 键
vbKeyZ 90 Z 键
0 至 9 键与数字 0 – 9 的 ASCII 码相同：
常数 值 描述
vbKey0 48 0 键
vbKey1 49 1 键
vbKey2 50 2 键
vbKey3 51 3 键
vbKey4 52 4 键
vbKey5 53 5 键
vbKey6 54 6 键
vbKey7 55 7 键
vbKey8 56 8 键
vbKey9 57 9 键
下列常数代表数字键盘上的键：
常数 值 描述
vbKeyNumpad0 0x60 0 键
vbKeyNumpad1 0x61 1 键
vbKeyNumpad2 0x62 2 键
vbKeyNumpad3 0x63 3 键
vbKeyNumpad4 0x64 4 键
vbKeyNumpad5 0x65 5 键
vbKeyNumpad6 0x66 6 键
vbKeyNumpad7 0x67 7 键
vbKeyNumpad8 0x68 8 键
vbKeyNumpad9 0x69 9 键
vbKeyMultiply 0x6A MULTIPLICATION SIGN (*) 键
vbKeyAdd 0x6B PLUS SIGN (+) 键
vbKeySeparator 0x6C ENTER 键
vbKeySubtract 0x6D MINUS SIGN (-) 键
vbKeyDecimal 0x6E DECIMAL POINT (.) 键
vbKeyDivide 0x6F DIVISION SIGN (/) 键
下列常数代表功能键：
常数 值 描述
vbKeyF1 0x70 F1 键
vbKeyF2 0x71 F2 键
vbKeyF3 0x72 F3 键
vbKeyF4 0x73 F4 键
vbKeyF5 0x74 F5 键
vbKeyF6 0x75 F6 键
vbKeyF7 0x76 F7 键
vbKeyF8 0x77 F8 键
vbKeyF9 0x78 F9 键
vbKeyF10 0x79 F10 键
vbKeyF11 0x7A F11 键
vbKeyF12 0x7B F12 键
vbKeyF13 0x7C F13 键
vbKeyF14 0x7D F14 键
vbKeyF15 0x7E F15 键
vbKeyF16 0x7F F16 键