10 native tips on JavaScript

10 native tips on JavaScript

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

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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.exe c (temp) = null ){ Icount = icount + 1 } Else { Icount = icount + 2 } Strre + = temp } Else { Break } } Return strre + "..." }

2. Obtain the domain name host

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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

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

4. Replace all

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String. prototype. replaceAll = function (s1, s2 ){ Return this. replace (new RegExp (s1, "gm"), s2) }

5. Escape html tags

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Function HtmlEncode (text ){ Return text. replace (// g ,'&'). replace (/\ "/g ,'"'). replace (/</g, '<'). replace (/>/g, '> ') }

6. Restore html tags

Copy the Code as follows:

Function HtmlDecode (text ){

Return text. replace (/&/g, '&'). replace (/"/g, '\"'). replace (// g, '> ')

}

7. time and date format conversion

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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.

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Function isDigit (value ){ Var patrn =/^ [0-9] * $ /; If (patrn.exe c (value) = null | value = ""){ Return false } Else { Return true } }

9. Set the cookie value

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

10. Obtain the cookie value

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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.