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function test(){
var m=n=1;
alert(m);
}
alert(n);
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function test(){
var m=n=1;
alert(m);
}
test();
alert(n);
//µ±testÖ´Ðкó£¬Í³Í³±ä³ÉÈ«¾Ö±äÁ¿
function test() {
return 1
+2
}
alert(test())
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function test() {
return 1
2
}
alert(test())
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function test() {
return
2
}
alert(test())
ÀàËƵĻ¹ÓУ¬ÓÉȺÀïµÄabcdÌṩ
function test() {
1
+2-
3
}
alert(test())
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ÉÏÃæÕâÌâÒ²¿ÉÒÔÒý³öÕâôһÌ⣬ÓÉȺÀïµÄabcdÌṩ
function test() {
try {
return 1;
} finally {
return 2;
}
}
alert(test())
//Ò»¸öº¯ÊýÖ´Ðкó±Ø¶¨·µ»Ø£¨return£©Ò»¸ö½á¹û£¬Èç¹ûÔ­º¯ÊýÌåûÓÐreturnÓï¾ä±Ø·µ»Øundefined¡£
//Èç¹ûÀïÃæ´æÔÚÒì³£´¦Àí£¬finally¿éÖеÄreturn µÄÓÅÏȼ¶¸ßÓÚtry ¿éÖеÄreturn
alert(Number())
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alert(+" 3 ")
//²Î¼ûECMA3-5thµÄµÚ9.3½ÚÓë15.7.1½Ú¡£Èç¹ûNumber([value])µÄvalue²»´æÔÚ£¬Ôò·µ»Ø0
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//ÕâÊÇÒ»¸öÄÚ½¨º¯Êý£¬Ö»´æÔÚÓÚJSÒýÇæÖУ¬¶ÔÓÚÕâ¸östrËü»áÖ´ÐÐtrim²Ù×÷£¬ÔÙÖ´ÐÐÊý×Öת»»£¬
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var a = +' Infinity ';
alert(typeof a) //number
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var add = function(el){
alert(el === el+1)
}
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add(Infinity)
add(Number.MAX_VALUE)
add(Number.POSITIVE_INFINITY)
add(Number.NEGATIVE_INFINITY)
alert([1,2,3,4,5][0..toString.length])
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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 space ......

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{
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JavaScript ¶¯Ì¬Êý×é ʵÀý


<html>
<body>
<script type="text/javascript">
//·½·¨Ò»
var num_arr= [];
for (var i = 0 ; i < 10 ;  i ++)
{
  num_arr[i] = i; 
}
document.write(num_arr+'</br>');
//·½·¨¶þ
var obj_arr=new Array();
obj_arr[6]='ss';
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