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In the javascript text box, enter four numbers to automatically add spaces to the script _ form Effect

Source: Internet
Author: User
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In the javascript text box, enter four numbers and then add spaces. If you enter multiple characters, you will find that four numbers are automatically added with spaces.

<Html> <script language = javascript> function test () {var len = document. getElementById ('Card '). value. length; var reg =/\ s {1,}/g; var card _ = ""; var card = document. getElementById ('Card '). value; // remove space card = card. replace (reg, ""); for (var I = 0; I <len; I ++) {if (I = 3 | I = 7 | I = 11 | I = 15) {card _ = card _ + card. charAt (I) + "";} else {card _ = card _ + card. charAt (I) ;}} document. getElementById ("card "). value = card _;} script <body> <input type = "text" id = "card" onkeyup = "test ()"> </body> </ptml>
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]

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