Have to share the JavaScript common method function set (top) _javascript tips

This article, the collection of some of the more commonly used JavaScript functions, I hope to learn from the friends of JS help.
1. String length Intercept

function Cutstr (str, len) {
  var temp,
    icount = 0,
    patrn =/[^\x00-\xff]/,
    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. Replace All

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

3. Clear Space

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

4. Clear left space/right space

function LTrim (s) {return s.replace (/^ (\s*| *)/, "");} 
function RTrim (s) {return s.replace (/(\s*| *) $/, "");}

5. Determine whether to start with a string

String.prototype.startWith = function (s) {return
  this.indexof (s) = = 0
}

6. Determine whether to end with a string

String.prototype.endWith = function (s) {
  var d = this.length-s.length;
  return (d >= 0 && this.lastindexof (s) = = d)
}

7. Escape HTML Tags

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

8. 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}

9. Determine whether the number type

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

10. 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;"
}

11. Get Cookie Value

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

12. Add to Favorites

function Addfavorite (sURL, stitle) {
  try {
    window.external.addFavorite (sURL, stitle)
  } catch (e) {
    try {
      Window.sidebar.addPanel (stitle, sURL, "")
    } catch (e) {
      alert ("Join collection failed, please add with Ctrl+d")
    }
  }
}

13. Set as homepage

function setHomePage () {
  if (document.all) {
    document.body.style.behavior = ' url (#default #homepage) ';
    Document.body.setHomePage (' http://w3cboy.com ')
  } else if (Window.sidebar) {
    if (window.netscape) {
      try {
        Netscape.security.PrivilegeManager.enablePrivilege ("Universalxpconnect")
      } catch (e) {
        alert ("This operation is rejected by the browser, if you want to enable this feature, enter About:config in the Address bar, and then Signed.applets.codebase_principal_support Value is true "
        }
    }
    var prefs = components.classes[' @mozilla. Org/preferences-service;1 '].getservice ( Components.interfaces.nsIPrefBranch);
    Prefs.setcharpref (' browser.startup.homepage ', ' http://w3cboy.com ')
  }

14. Load Style File

function Loadstyle (URL) {
  try {
    document.createstylesheet (URL)
  } catch (e) {
    var csslink = Document.createelement (' link ');
    Csslink.rel = ' stylesheet ';
    Csslink.type = ' text/css ';
    csslink.href = URL;
    var head = document.getElementsByTagName (' head ') [0];
    Head.appendchild (Csslink)
  }
}

15. Return script Content

function Evalscript (s) {
  if (s.indexof (' <script ') = = 1) return s;
  var p =/<script[^\>]*?> ([^\x00]*?) <\/script>/ig;
  var arr = [];
  while (arr = p.exec (s)) {
    var p1 =/<script[^\>]*?src=\ "([^\>]*?) \ "[^\>]*? (reload=\ "1\")? (?: Charset=\ "([\w\-]+?) \ ")?><\/script>/i;
    var arr1 = [];
    arr1 = P1.exec (arr[0]);
    if (arr1) {
      appendscript (arr1[1], ', arr1[2], arr1[3]);
    } else {
      P1 =/<script (. *?) > ([^\x00]+?) <\/script>/i;
      arr1 = P1.exec (arr[0]);
      Appendscript (', arr1[2], Arr1[1].indexof (' reload= ')!=-1);
    }
  return s;
}

16. Clear Script Content

function Stripscript (s) {return
  s.replace (/<script.*?>.*?<\/script>/ig, ');
}

17. Dynamically Loading script files

function Appendscript (src, text, reload, CharSet) {var id = hash (src + text);
  if (!reload && in_array (ID, evalscripts)) return;
  if (Reload && $ (ID)) {$ (id). Parentnode.removechild ($ (ID));
  } evalscripts.push (ID);
  var scriptnode = document.createelement ("script");
  Scriptnode.type = "Text/javascript";
  Scriptnode.id = ID; Scriptnode.charset = CharSet?
  CharSet: (Browser.firefox document.characterSet:document.charset);
      try {if (src) {scriptnode.src = src;
      Scriptnode.onloaddone = false;
        Scriptnode.onload = function () {Scriptnode.onloaddone = true;
       JSLOADED[SRC] = 1;
       }; Scriptnode.onreadystatechange = function () {if (scriptnode.readystate = = ' Loaded ' | | | scriptnode.readystate = = '
          Complete ') &&!scriptnode.onloaddone) {Scriptnode.onloaddone = true;
        JSLOADED[SRC] = 1;
    }
       };
    else if (text) {scriptnode.text = text; } DOCUMENT.GEtelementsbytagname (' head ') [0].appendchild (Scriptnode);
 catch (e) {}}

18. Returns the element object retrieved by ID

function $ (ID) {return
  !id null:document.getElementById (ID);
}

19. Cross-Browser binding events

function Addeventsamp (OBJ,EVT,FN) { 
  if (!otarget) {return;}
  if (obj.addeventlistener) { 
    obj.addeventlistener (evt, FN, false); 
  } else if (obj.attachevent) { 
    obj.attachevent (' on ' +evt,fn); 
  } else{
    otarget["on" + sevttype] = fn;
  } 

20. Cross-Browser Delete events

function Delevt (OBJ,EVT,FN) {
  if (!obj) {return;}
  if (obj.addeventlistener) {
    obj.addeventlistener (evt,fn,false);
  } else if (otarget.attachevent) {
    obj.attachevent ("on" + EVT,FN);
  } else{
    obj["on" + evt] = fn;
  }

21. Add an on method for the element

Element.prototype.on = Element.prototype.addEventListener;
 
NodeList.prototype.on = function (event, FN) {,
  [] [' ForEach '].call (this, function (EL) {
    El.on (event, FN);
  }) ;
  return this;
};

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