commonly used javaScript codes

judgment characters are all composed of characters of Amurz or Amurz:

 & lt;input onblur="if (/[^ a-zA-Z]/g.test (this.value)) alert ('wrong') & quot;>

judgment character consists of letters and numbers:

 & lt;input onblur="if (/[^ 0-9a-zA-Z]/g.test (this.value)) alert ('wrong') & quot;>

judgment characters consist of letters and numbers, underscores, and periods. And can only begin with an underscore and a letter:

/^ ([a Meiz Amurz] {1}) ([\ w] *) $/g.test (str)

determine the type of browser:

 window.navigator.appName

determine the version of ie:

 window.navigator.appVersion

judge the resolution of the client:

 window.screen.height; window.screen.width

check boxes: all, multiple, none, reverse:

 & lt;form name=hrong>& lt;input type=checkbox name=All onclick="checkAll ('mm') & quot;> Select all & lt;br/>& lt;input type=checkbox name=mm onclick="checkItem ('All') & quot;>






")Document.write (cidInfo & quot;340524198002300019"), & quot;
")Document.write (cidInfo & quot;510215198108241648"), & quot;
")Document.write (cidInfo & quot;34052419800101001x"), & quot;
")& lt;/script>