10 native JavaScript skills and javascript skills

10 native JavaScript skills and javascript skills

1. String Length Truncation

 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     } else {       break     }   }   return strre + "..." }

2. Obtain 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 Spaces

 String.prototype.trim = function() {   var reExtraSpace = /^\s*(.*?)\s+$/;   return this.replace(reExtraSpace, "$1") }

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 codeThe Code is as follows:
Function HtmlDecode (text ){
Return text. replace (// g ,'&'). replace (/"/g ,'\"'). replace (/</g, '<'). replace (/>/g, '> ')
}

7. time and date format conversion

Date. prototype. format = function (formatStr) {var str = formatStr; var Week = ['day', 'yi', '2', '3', '4', '5 ', '6']; str = str. replace (/yyyy | YYYY/, this. getFullYear (); str = str. replace (/yy | YY/, (this. getYear () % 100)> 9? (This. getYear () % 100 ). 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. Determine whether the data type is Numeric.

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

9. Set the 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 * 60 * 60 * 1000);   document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;" }

10. Obtain the 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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