169. Another way to dynamically modify the CSS This.runtimeStyle.cssText = "color: #990000; border:1px solid #cccccc";//170. Regular expression matches a regular expression of a Chinese character: [\ U4E00-\U9FA5] matches double-byte characters (including Chinese characters): [^\x00-\xff] Apply: Compute the length of a string (a double-byte character length meter 2,ascii character 1) string.prototype.len=function () {
Return This.replace ([^\x00-\xff]/g, "AA"). Length;} A regular expression that matches a blank row: \n[\s|] *\r regular expression that matches the HTML tag:/< (. *) >.*<\/\1>|< (. *) \/>/matches a regular expression with a trailing space: (^\s*) | (\s*$) Application: JavaScript does not have a trim function like VBScript, we can use this expression to implement, as follows: String.prototype.trim = function () {return this.rep Lace (/(^\s*) | (
\s*$)/g, ""); Using regular expressions to decompose and transform IP addresses: The following is a JavaScript program that uses regular expressions to match an IP address and converts an IP address to a corresponding numeric value: function IP2V (IP) {re=/(\d+) \. ( \d+) \. (\d+) \. (\d+)/g//matching IP address regular expression if (Re.test (IP)) {return Regexp.$1*math.pow (255,3)) +regexp.$2*math.pow (255,2)) +regexp.$3*255
+regexp.$4*1} else {throw new Error ("not a valid IP address!")}} However, if the above program does not use regular expressions, and the split function to decompose directly can be simpler, the program is as follows: Var ip= "10.100.20.168" Ip=ip.split (".") Alert ("IP value is:" + (ip[0]*255*255* 255+ip[1]*255*255+ip[2]*255+ip[3]*1) A regular expression matching an email address: \w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * Matching the URL of the regular expression: http://([\w-]+\.)
+[\w-]+ (/[\w-/?%&=]*)? An algorithmic program that uses regular expressions to remove repetitive characters from a string: var s= "Abacabefgeeii" var s1=s.replace (/(.). *\1/g, "$") var re=new RegExp ("[" +s1+ "]", "G") var s2=s.replace (Re, "") alert (S1+S2)//Result: ABCEFGI The idea is to use a back reference to take out the characters that contain duplicates, and then to A duplicate character creates a second expression, takes a distinct character, and concatenates the two.
This method may not apply to strings that are required for character order. A JavaScript program that extracts a filename from a URL address with a regular expression is the following result for Page1 s= "http://www.9499.net/page1.htm" S=s.replace (/(. *\/) {0,} ( [^\.] +). */ig, "$") alert (s)/////////use regular expressions to restrict text boxes in a Web page form input: Restrict only Chinese in regular expressions: onkeyup= "Value=value.replace" (/[^\u4e00-\ u9fa5]/g, "onbeforepaste=" clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\u4e00-\ u9fa5]/g, ') ' restricts only full-width characters in regular expression: onkeyup= "Value=value.replace (/[^\uff00-\uffff]/g,") "onbeforepaste="
Clipboarddata.setdata (' Text ', Clipboarddata.getdata (' text '). Replace (/[^\uff00-\uffff]/g, ') "
Only numbers can be entered with regular expression restrictions: onkeyup= "Value=value.replace (/[^\d]/g,")
"Onbeforepaste=" clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') " Only numbers and English can be entered with regular expression restrictions: onkeyup= "Value=value.replace (/[\w]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ',
Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') "171. Set up and use cookies <HTML> <BODY> settings with read cookies ... The value written to the cookie <input type=text name=gg> <input type = button value = "Set cookie" OnClick = "set ()" > <input type = Button Value = "Read cookie" OnClick = "Get ()" > <input TYPE = TEXT NAME = textbox> </BODY> <script Langua Ge= "JavaScript" > Function Set () {var Then = new Date () Then.settime (Then.gettime () + 60*1000)//60 seconds Document.cookie =
"Cookie1=" +gg.value+ "; expires=" + then.togmtstring ()} function get () {var cookiestring = new String (document.cookie) var cookieheader = "Cookie1=" var beginposition = Cookiestring.indexof (Cookieheader) if (beginposition!=-1) {docu Ment.all.Textbox.value = cookiestring.substring (beginposition + COokieheader.length)} else Document.all.Textbox.value = "Cookie not Found!"}
</SCRIPT>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
