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var Cookie = {
// 读取
read : function(name){
var cookieStr = "; "+document.cookie+"; ";
var index = cookieStr.indexOf("; "+name+"=");
if (index!=-1){
var s = cookieStr.substring(index+name.length+3,cookieStr.length);
return unescape(s.substring(0, s.indexOf("; ")));
}else{
return null;
}
},
// 设置
set : function(name,value,expires){
var expDays = expires*24*60*60*1000;
var expDate = new Date();
expDate.setTime(expDate.getTime()+expDays);
var expString = expires ? ";
expires="+expDate.toGMTString() : "";
var pathString = ";path=/";
document.cookie = name + "=" + escape(value) + expString + pathString;
},
// 删除
del : function(name){
var exp = new Date(new Date().getTime()-1);
var s=this.read(name);
if(s!=null) {
document.cookie= name + "="+s+";
expires="+exp.toGMTString()+";path=/"
}
}
};
// demo:
Cookie.set("xuanfengge", "www.xuanfengge.com", 7);
alert(Cookie.read("xuanfengge"));
Cookie.del("xuanfengge");
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var aString = "Hello!";
var bString = new String("Hello!");
if( aString == "Hello!" ){ } //结果: true
if( aString == bString ){ } //结果: true
if( aString === bString ){ } //结果: false (两个对不同,尽管它们的值相同)
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var myString = "hello everybody.";
// 如果检索不到会返回-1,检索到的话返回在该串中的起始位置
if( myString.indexOf("every") > -1 ){ } //结果: true
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var myString = "I is your father.";
var result = myString.replace("is","am"); //结果: "I am your father."
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//截取第 6 位开始的字符
var myString = "Every good boy does fine.";
var section = myString.substring(6); //结果: "good boy does fine."
//截取第 0 位开始至第 10 位为止的字符
var myString = "Every good boy does fine.";
var section = myString.substring(0,10); //结果: "Every good"
//截取从第 11 位到倒数第 6 位为止的字符
var myString = "Every good boy does fine.";
var section = myString.slice(11,-6); //结果: "boy does"
//从第 6 位开始截取长度为 4 的字符
var myString = "Every good boy does fine.";
var section = myString.substr(6,4); //结果: "good"
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function fucCheckLength(strTemp){
var i,sum;
sum=0;
for(i=0;i<strTemp.length;i++){
if ((strTemp.charCodeAt(i)>=0) && (strTemp.charCodeAt(i)<=255)){
sum=sum+1;
}else{
sum=sum+2;
}
}
return sum;
}
// demo:
fucCheckLength("qwe"); //3
fucCheckLength("轩枫"); //4
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//合法日期：yyyy-mm-dd,分隔符可以为-/.
String.prototype.isDate = function() {
var year,month,date,day;
var reg = /^([12]\d{3})([-\/\.])([01]?\d)\2([0-3]?\d)$/;
if (!reg.test(this)) return false;
year = RegExp.$1.parseInt();
month = RegExp.$3.parseInt() - 1;
date = RegExp.$4.parseInt();
day = new Date(year,month,date);
return ((date == day.getDate()) && (month == day.getMonth()));
}
// demo:
"1999-12-20".isDate()
// 合法日期：yyyy-mm-dd,分隔符可以为-/
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function dateDiff(date1,date2) {
var year,month,date,day1,day2;
var reg = /^(\d{4})([-\/\.])(\d{2})\2(\d{2})$/;
reg.test(date1);
year = RegExp.$1.parseInt();
month = RegExp.$3.parseInt() - 1;
date = RegExp.$4.parseInt();
day1 = new Date(year,month,date);
reg.test(date2);
year = RegExp.$1.parseInt();
month = RegExp.$3.parseInt() - 1;
date = RegExp.$4.parseInt();
day2 = new Date(year,month,date);
return (day1.getTime() - day2.getTime()) / 86400000;
}
// demo:
// 用以前，先用isDate()判断一下是否合法日期
// 注意：这个函数的reg和isDate()里的reg小you不同
// 以天为单位(date1-date2=?),可以用来比较2个日期大小
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function isEmpty(obj){
for(var key in obj){
return false;
}
return true;
}
// demo:
isEmpty({}); //true
isEmpty({"key":"value"}); //false
// jq版本
$.isEmptyObject({}); //true
$.isEmptyObject({"key", "value"}); //false
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Object.prototype.length = function() {
var count = 0;
for(var i in this){
count ++;
}
return count;
};
// demo：
var a = {a:1, b:2, c:3, d:4};
alert(a.length()); // 5
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原文：http://www.cnblogs.com/jmjweb/p/4131003.html