IDC资讯中心
string .length 汉字为两个字符处理
.tlength
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<script>
/*
this following code are designed and writen by windy_sk <seasonx@163.net>
you can use it freely, but u must held all the copyright items!
*/
//测字符串实际长度
string.prototype.tlength = function(){var arr=this.match(/[^\x00-\xff]/ig);return this.length+(arr==null?0:arr.length);}
//字符串左取
string.prototype.left = function(num,mode){if(!/\d+/.test(num))return(this);var str = this.substr(0,num);if(!mode) return str;var n = str.tlength() – str.length;num = num – parseint(n/2);return this.substr(0,num);}
//字符串右取
string.prototype.right = function(num,mode){if(!/\d+/.test(num))return(this);var str = this.substr(this.length-num);if(!mode) return str;var n = str.tlength() – str.length;num = num – parseint(n/2);return this.substr(this.length-num);}
//字符串包含
string.prototype.getcount = function(str,mode){return eval("this.match(/("+str+")/g"+(mode?"i":"")+").length");}
//字符串去除两端空字符
string.prototype.trim=function(){return this.replace(/(^\s*)|(\s*$)/g,"");}
string.prototype.ltrim = function(){return this.replace(/(^\s*)/g, "");}
string.prototype.rtrim = function(){return this.replace(/(\s*$)/g, "");}
document.write("aa啦啦aa.tlength() = " + "aa啦啦aa".tlength());
document.write("<br>");
document.write("aabbcc.tlength() = " + "aabbcc".tlength());
document.write("<br>");
document.write("aa啦啦aa.left(4) = " + "aa啦啦aa".left(4));
document.write("<br>");
document.write("aa啦啦aa.left(4,true) = " + "aa啦啦aa".left(4,true));
document.write("<br>");
document.write("aa啦啦aa.right(4) = " + "aa啦啦aa".right(4));
document.write("<br>");
document.write("aa啦啦aa.right(4,true) = " + "aa啦啦aa".right(4,true));
document.write("<br>");
document.write("abacae.getcount(a) = " + "abacae".getcount("a"));
document.write("<br>");
document.write("abacae.getcount(a,true) = " + "abacae".getcount("a",true));
document.write("<br>");
document.write(" abc de .ltrim() = " + " abc de ".ltrim());
document.write("<br>");
document.write(" abc de .rtrim() = " + " abc de ".rtrim());
document.write("<br>");
document.write(" abc de .trim() = " + " abc de ".trim());
</script>
再来几个函数，getcookie(),getquery(),datediff(),dateadd(),b2s()，原+改
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function getcookie(mainkey,subkey) {
var reg = new regexp("(^| )"+mainkey+"=([^;]*)(;|$)");
var arr = document.cookie.match(reg);
if (arguments.length == 2) {
if (arr!=null)
return key(subkey,arr[2]);
else
return null;
} else if (arguments.length == 1) {
if (arr!=null)
return unescape(arr[2]);
else
return null;
}
function key(subkey,findwith) {
var arr,reg = new regexp("(^| |&)"+subkey+"=([^&]*)(&|$)");
var findwith = findwith?findwith:document.cookie;
if (arr = findwith.match(reg))
return unescape(arr[2]);
else
return null;
}
}
function getquery(name) {
var reg = new regexp("(^|&)"+name+"=([^&]*)(&|$)");
var r = location.search.substr(1).match(reg)
if (r!=null) return unescape(r[2]);
}
function dateadd(strinterval, numday, dtdate) {
var dttmp = new date(dtdate);
if (isnan(dttmp)) dttmp = new date();
switch (strinterval) {
case "s":return new date(date.parse(dttmp) + (1000 * numday));
case "n":return new date(date.parse(dttmp) + (60000 * numday));
case "h":return new date(date.parse(dttmp) + (3600000 * numday));
case "d":return new date(date.parse(dttmp) + (86400000 * numday));
case "w":return new date(date.parse(dttmp) + ((86400000 * 7) * numday));
case "m":return new date(dttmp.getfullyear(), (dttmp.getmonth()) + numday, dttmp.getdate(), dttmp.gethours(), dttmp.getminutes(), dttmp.getseconds());
case "y":return new date((dttmp.getfullyear() + numday), dttmp.getmonth(), dttmp.getdate(), dttmp.gethours(), dttmp.getminutes(), dttmp.getseconds());
}
}
// datediff("m","2002/12/1 00:00:00","2004/12/1 00:00:00")
function datediff(strinterval, dtstart, dtend) {
var dtstart = new date(dtstart);
if (isnan(dtstart)) dtstart = new date();
var dtend = new date(dtend);
if (isnan(dtend)) dtend = new date();
switch (strinterval) {
case "s":return parseint((dtend – dtstart) / 1000);
case "n":return parseint((dtend – dtstart) / 60000);
case "h":return parseint((dtend – dtstart) / 3600000);
case "d":return parseint((dtend – dtstart) / 86400000);
case "w":return parseint((dtend – dtstart) / (86400000 * 7));
case "m":return (dtend.getmonth()+1)+((dtend.getfullyear()-dtstart.getfullyear())*12) – (dtstart.getmonth()+1);
case "y":return dtend.getfullyear() – dtstart.getfullyear();
}
}
// b2s("11新浪网!@#程序员_+}{:><")
function b2s(strng) {
var matches = strng.match(/[\x21-\x7e]/g);
for (var i=0;i<matches.length;i++) {
strng = strng.replace(matches[i],string.fromcharcode(matches[i].charcodeat (0)+65248))
}
return strng;
}
来几个，ie5下原型扩展
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/*number object*/
if(!number.prototype.tofixed) {
number.prototype.tofixed = function(n) {
with(math) return round(number(this)*pow(10,n))/pow(10,n)
}
}
/*array object*/
if (!array.prototype.pop) {
array.prototype.pop = function() {
var lastelement = this[this.length-1];
this.length = math.max(this.length-1,0);
return lastelement;
}
}
if (!array.prototype.push) {
array.prototype.push = function() {
for(var i=0;i<arguments.length;i++) {
this[this.length]=arguments[i];
}
return this.length;
}
}
if (!array.prototype.shift) {
array.prototype.shift = function() {
var firstelement = this[0];
this.reverse();
this.pop();
this.reverse();
return firstelement;
}
}
if (!array.prototype.splice) {
array.prototype.splice = function() {
var start = arguments[0];
var deletecount = start+arguments[1];
var deleteitem = this.slice(start,deletecount);
var beforeitem = this.slice(0,start);
var afteritem = this.slice(deletecount);
this.length=beforeitem.length;
var i;
for (i=2;i<arguments.length;this[this.length]=arguments[i++]);
for (i=0;i<afteritem.length;this[this.length]=afteritem[i++]);
return deleteitem;
}
}
if (!array.prototype.unshift) {
array.prototype.unshift = function() {
var arr = new array();
for (var i=0;i<arguments.length;arr[i]=arguments[i++]);
arr = arr.concat(this);
this.length = 0;
for (i=0;i<arr.length;this[i]=arr[i++]);
}
}
