Share 10 native JavaScript tips __java

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1, native JavaScript implementation string length intercept

function Cutstr (str, len) {    var temp;     var icount = 0;     var patrn =
/[^\x00-\xff]/;
    var Strre = "";     for (var i = 0; i < str.length i++) {        if (icount < le n-1) {            temp = str.substr (i, 1);              if (patrn.exec (temp) = null) {                 icount = icount + 1             } else {           
     icount = icount + 2            }             Strre = Temp         } else {            Break        }    }     return Strre + "..."}

2, native JavaScript acquisition domain name host

function GetHost (URL) {
var host = ' null ';
if (typeof url = = "undefined" | | | null = = URL) {
url = window.location.href;
The
var regex =/^\w+\:\/\/([^\/]*). * *;
var match = Url.match (regex);
if (typeof match!= "undefined" && null!= match) {
host = match[1];
} return
host;
}

3, native JavaScript clear space

String.prototype.trim = function () {
var reextraspace =/^\s* (. *?)    \s+$/;
Return This.replace (Reextraspace, "$")
}

4. Native JavaScript replaces all

String.prototype.replaceAll = function (S1, S2) {return
this.replace (new RegExp (S1, "GM"), S2)
}

5. Native JavaScript escape HTML tags

function HtmlEncode (text) {return
text.replace (/&/g, ' &amp '). Replace (/\ "/g, ' &quot;"). Replace (/</g, ' &lt; '). Replace (/>/g, ' &gt; ')
}

6. Native JavaScript restore HTML tags

function HtmlDecode (text) {return
text.replace (/&amp;/g, ' & '). Replace (/&quot;/g, ' \ "). Replace (/& amp;lt;/g, ' < '). Replace (/&gt;/g, ' > ')
}

7. Native JavaScript time date format conversion

Date.prototype.Format = function (formatstr) {    var str = formatstr;     var Week = [' Day ',
' One ', ' two ', ' three ', ' four ', ' five ', ' six '];     str = str.replace (/yyyy|
yyyy/, This.getfullyear ());     str = str.replace (/yy| yy/, (this.getyear ()%) > 9?
(This.getyear ()%). ToString (): ' 0 ' + (this.getyear ()% 100));     str = str.replace (/mm/, (This.getmonth () + 1) > 9?
(This.getmonth () + 1). ToString (): ' 0 ' + (this.getmonth () + 1));
    str = str.replace (/m/g, (This.getmonth () + 1));     str = str.replace (/w|
W/g, Week[this.getday ()]);     str = str.replace (/dd| Dd/, This.getdate () > 9?
This.getdate (). toString (): ' 0 ' + this.getdate ());     str = str.replace (/d|
D/g, This.getdate ());     str = str.replace (/hh| hh/, This.gethours () > 9?
This.gethours (). toString (): ' 0 ' + this.gethours ());     str = str.replace (/h| H/g, THIS.GEthours ());     str = str.replace (/mm/, This.getminutes () > 9? this.getminutes (). toString (): ' 0 ' + this.getminutes
());
    str = str.replace (/m/g, This.getminutes ());     str = str.replace (/ss| ss/, This.getseconds () > 9?
This.getseconds (). toString (): ' 0 ' + this.getseconds ());     str = str.replace (/s|
S/g, This.getseconds ());     return STR}

8. Native JavaScript Determines whether it is a numeric type

function IsDigit (value) {
var patrn =/^[0-9]*$/;
if (patrn.exec (value) = NULL | | value = = "") {return
false
} else {return
true
}
}

9, native JavaScript set cookie value

function Setcookie (name, value, Hours) {
    var d = new Date ();
    var offset = 8;
    var UTC = D.gettime () + (D.gettimezoneoffset () * 60000);
    var nd = UTC + (3600000 * offset);
    var exp = new Date (nd);
    Exp.settime (Exp.gettime () + Hours * * * 1000);
    Document.cookie = name + "=" + Escape (value) + ";p ath=/;expires=" + exp.togmtstring () + ";d omain=x.com;"
}

10. Native JavaScript gets cookie value

function GetCookie (name) {
var arr = document.cookie.match (New RegExp ("(^|)" + name + "= ([^;]    *)(;|$)"));
if (arr!= null) return unescape (arr[2));
return null
}