Javascript Óï·¨½²½â
1.delete ÔËËã·û
¶ÔÏóɾ³ýÒ»¸öÊôÐÔ£¬»òÊý×éÖÐɾ³ýÒ»¸öÔªËØ¡£½«ÎÞÓõÄÄÚÈÝɾ³ýÒÔ½ÚÊ¡¿Õ¼ä¡£
delete expression
example:
var person = new Object();
person.sex = "male";
alert(person.sex);
delete person.sex;
alert(person.sex);
2. ‘,' ÔËËã·û
var a = 2;
var b = 3;
var c = (a++,b++,a+b);
alert(c); // 7
3.for each ...in,±éÀú¶ÔÏóÊôÐÔµÄÖµ»òÊý×éµÄÔªËØ
//´´½¨¶ÔÏó ÓÃ{}´´½¨Ò»¸öжÔÏ󣬲¢ÓÃÖ¸¶¨µÄ¼üºÍÖµ³õʼ»¯¸Ã¶ÔÏó.
var myObject = {hisName:"javascript",age:11,belonging:"Mozilla"};
for each ( var item in myObject){
document.write(item);
}
4. withÓï¾ä , ¿ÉÒÔ·½±ãµØÒýÓÃij¸öÌض¨¶ÔÏóµÄ·½·¨ºÍÊôÐÔ
Óï·¨¸ñʽ£º
with(object){
statement(s);
}
example:
var rightNow = new Date();
with(rightNow){
document.write(getDay());
}
»ò
var rightNow = new Date();
document.write(rightNow.getDay());
with£ºÊ¡ÂÔÁËrightNow¡£
5¡£functionÄäÃûº¯Êý£¬ÕâÖÖº¯Êý½«Ò»¶Î“º¯ÊýÎı¾”´æ´¢ÔÚÒ»¸ö±äÁ¿ÖÐ.Ö»ÄÜÔÚÃüÃûÖ®ºó£¬²Å¿ÉʹÓÃ.
Óï·¨:
var myFunc = function(arg_1,arg_2,arg_3,....,arg_n){
//Ö´ÐÐÓï¾ä
return "һЩÊý¾Ý»ò±äÁ¿";
}
º¯ÊýÎı¾Ò²¿É×÷Ϊº¯Êý»ò·½·¨µÄ²ÎÊý
var yourname = "zhoubc";
afunc(function(){document.write(yourname);},200);
6.Object Àà
¹¹Ô췽ʽ
1.var obj_object = new Person(parameter);
function Person(parameter){
}
2.var obj_object = {ÊôÐÔÃû£ºÊôÐÔÖµ,...ÊôÐÔÃû:ÊôÐÔÖµ}
»ùÀà
´´½¨ÀàµÄʵÀý
var person = new Object();
person.sex = "male";
person.age = 28;
person.birthday = new Date(1970,0,1);
»ò
var person = {sex:"male",age:28,birthday:new Date(1970,0,1)};
´òÓ¡
for(var i in person){
document.write(person[i]);
}
Ïà¹ØÎĵµ£º
·½·¨£º string.replace(new RegExp(oldString,"gm"),newString))
gm g=global, m=multiLine£¬´óÖÂÉÏ·½·¨¾ÍÊÇÕâÑùµÄ£¬¿ÉÒÔʵÏÖÌ滻ȫ²¿Ö¸¶¨×Ö´®
ÁíÒ»¸ö¼òµ¥µÄÑéÖ¤JSµÄ·½·¨£º
ÔÚä¯ÀÀÆ÷µØÖ·À¸ÊäÈë
javascript:alert("abcabcabc".replace(new RegExp("a","gm"),"ad&quo ......
<mce:script type="text/javascript"><!--
function SetCookie(name,value,expire) {
var exp = new Date();
exp.setTime(exp.getTime() + expire);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
} ......
function openCheck()
{
if (!this.external)
{
app.alert("Acrobat¤Ç¤Ï実ÐФǤ¤Þ¤»¤ó");
this.closeDoc(true);
// var myDoc = event.target;
// myDoc.closeDoc(true);
}
}
openCheck();
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