JavaScript common features Summary _javascript tips

1. Input can only enter integer numbers and letters

$ (document). On (' KeyUp ', ' #no ', function () {
  var val = $.trim ($ (this). Val ());
  if (val = = NULL | | val = = ") return
    ;
  
  $ (this). Val (Val.replace (/[^0-9a-z]+/ig, '));  Can only enter integer numbers and Letters
});

Many other implementations that come out of Baidu are problematic. They do not accurately represent "only numbers and letters" because they enter punctuation in advance, such as allowing a decimal point to be entered. and other symbols. For example, the following is a Baidu out of the answer:

Value=value.replace (/[^\w\.\/]/ig, ')
value=value.replace (/[^\d|chun]/g, ')
Value=value.replace (/[^\w \.\/]/ig, "")

The answers are all problematic.

2. Email format Verification

function Validate_email (mythis) {
  var val = $.trim ($ (mythis). Val ());
  if (val = = NULL | | val = = "") {
    $ ("#email_error"). Text ("Email cannot be empty");
    $ (mythis). focus ();
    return;
  }
    
  if (Val!= null && val!= "") {
    if!/^[a-za-z0-9_-]+@[a-za-z0-9_-]+ (\.[ a-za-z0-9_-]+) +$/g.test (val)) {
      $ ("#email_error"). Text ("Email format error");
      $ (mythis). focus ();
      return;
    }
  $ ("#email_error"). Text ("");

3. Extract integer numbers and English letters from a string

$ (function () {
  var a = ' testabc,. 、,./Rice Cooker 123def '; 
  b = A.replace (/[^0-9]+/ig, "");
  alert (b);
  b = A.replace (/[^a-z]+/ig, "");
  alert (b);
});

4. jquery Cookie Plugin Usage

  var Isfs = $ (this). attr ("Datas");
  $.cookie ("Isfs", isfs,{expires:7});

The above mentioned is the entire content of this article, I hope you can enjoy.