Summary of js and jquery knowledge points

This article mainly shares with you a summary of js and jquery knowledge points, hoping to help everyone.

return statement:

Generally three usages: 1.return true======》Return the correct result of the current function.

2.Rturn false ====== "Back to the error processing results of the current function; terminate the processing, prevent the form of the form, and the default behavior has been bubbling.

            3.return =========》Return the current results to the page.

Summary: =====================》return true is equivalent to the executor, and return false is equivalent to the terminator. return is to return the current result.

Simple summary of regular rules:

var regExp = /(.*).(bak)$/;==========》Match suffix files in bak format

var reg = /^[\u4E00-\u9FA5]{2,4}$/;=====》matches two to four Chinese characters, generally used for name validation.

var tel = /^(\(\d{3,4}\)|\d{3,4}-)?\d{7,8}(-\d{1,4} )?$/;===》The validity of the phone number

var phone = /^1[34578]\d{9}$/;=====》The validity of the mobile phone number is 13 |14|15|17|18|The mobile phone number used at the beginning.

The data requested by the form, if the requested data is empty, use _ to complete it.

var $audit = $("#example5").find("tr").find("td");
    $.each($audit, function (k, v) {           
      //获取tr下所有的td的文本值        
        var audit = $audit.eq(k).text();       
         if (audit === null || audit === "") 
         {                $audit.eq(k).text("—");        }
   });

$.each(result.OCSPCRLs, function (i, v) 
{            //var ocsp = new Object();           
// ocsp.ocspIP = v.OCSPUrl;          
  ocsp.num = parseInt(i) + parseInt(1);//给每一条数据排序        
      //ocspList.push(ocsp);
   });
 ocsp.num = parseInt(i) + parseInt(1);//给每一条数据排序

If the custom attributes of general tags are set with js, they can be set through dataset. For example,

document.getElementById('dt').dataset.news= '321';

Then add an attribute such as

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