Share 10 native JavaScript tips _ javascript tips

This article will share with you the 10 frequently-used Native javascript tips I personally summarized, which are used in projects at ordinary times. Here we will summarize and record them. If you need them, you can refer to them. 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, '>') }

6. Restore html tags

The Code is as follows:

Function HtmlDecode (text ){
Return text. 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

The above is all the content of this article. I hope you will like it.