Summary of common javascript functions_javascript skills

1. input can only input integers, 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,''));  // 只能输入整数数字和字母
});

Many other implementation methods using Baidu have problems. They cannot accurately represent "only numbers and letters can be entered" because they pre-enter punctuation marks, such as allowing decimal points, . and other symbols to be entered. For example, the following answer from Baidu:

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

The above 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不能为空");
    $(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格式错误");
      $(myThis).focus();
      return;
    }
  }
  $("#email_error").text("");
}

3. Extract integers and English letters from strings

$(function(){
  var a = 'testAbc，。、,./电饭锅123def'; 
  b = a.replace(/[^0-9]+/ig,"");
  alert(b);
  b = a.replace(/[^a-z]+/ig,"");
  alert(b);
});

4. Use of jquery cookie plug-in

  var isFs = $(this).attr("datas");
  $.cookie("isFs",isFs,{ expires: 7 });

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