js determine whether or not a positive integer input. The function of the number of floating-point numbers, etc.

2009-10-24  来源:本站原创  分类:AJAX  人气:637 

1. The following is a list of some types of numerical interpretation of regular expressions

"^ \ \ d + $" / / non-negative integer (positive integer + 0)
"^ [0-9] * [1-9] [0-9] * $" / / a positive integer
"^((- \ \ d +) | (0 +))$" / / non-positive integer (negative integer + 0)
"^ - [0-9] * [1-9] [0-9] * $" / / a negative integer
"^ -? \ \ d + $" / / integer
"^ \ \ d + (\ \. \ \ d +)?$" / / non-negative floating-point numbers (floating point number is + 0)
"^(([ 0-9] + \ \. [0-9] * [1-9] [0-9 ]*)|([ 0-9] * [1-9] [0-9] * \ \. [0-9 ]+)|([ 0-9] * [1-9] [0-9 ]*))$" / / are floating point
"^((- \ \ d + (\ \. \ \ d +)?)|( 0 + (\ \ .0 +)?))$" / / non-floating-point number is (negative float + 0)
"^(-(([ 0-9] + \ \. [0-9] * [1-9] [0-9 ]*)|([ 0-9] * [1-9] [0-9 ] * \ \. [0-9 ]+)|([ 0-9] * [1-9] [0-9 ]*)))$" / / negative float
"^(-? \ \ d +) (\ \. \ \ d +)?$" / / float

2. In the process the use of

var r = / ^ [0-9] * [1-9] [0-9] * $ / / / positive integer

r.test (str); / / str for the character you want to judge the results of the implementation of return true or false

3. The test is then a function of the number of characters can be used to determine the date of the js function Email

function TestRgexp (re, s) (/ / parameters that re regular expression for s in order to determine the character

return re.test (s)

)

4. Function Application

<script type="text/javascript">

function TestRgexp (re, s) (/ / parameters that re regular expression for s in order to determine the character

return re.test (s)

)

var re = / ^ [0-9] * [1-9] [0-9] * $ /;

/ / Determine whether it is a positive integer

/ / Note: The procedures for the regular expression format Chiang Kai-shek: / the above regular expression (without double quotes) /
var s = prompt ( "Please enter the characters to judge", 10);

var result = TestRgexp (re, s); / / test to return true or false

alert (result);

</ script>

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