Share 10 native JavaScript tips _javascript tips

1, the implementation of string length interception

 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 < len-1) {
       temp = str.substr (i, 1);
       if (patrn.exec (temp) = = null) {
         icount = icount + 1
       } else {
         icount = icount + 2
       }
       Strre + = temp< c15/>} else {break}} return
   Strre + "..."
 }

2, get the domain name host

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

3, clear the space

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

4. Replace All

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

5. Escape HTML Tags

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

6. Restore HTML tags

Copy Code code as follows:

function HtmlDecode (text) {
Return Text.replace (/&/g, ' & '). Replace (/"/g, ' \"). Replace (/</g, ' < '). Replace (/>/g, ' > ')
}

7, 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, to determine whether the number of types

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

9. 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=360doc.com;"
 }

10. Get Cookie Value

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

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