Summarizing _javascript techniques of common native JS custom functions

JS Get Date function

Gets the current time date
function curenttime ()
{var now
  = new Date ();
  var year = Now.getfullyear ();    Year
  var month = Now.getmonth () + 1;   Month
  var day = Now.getdate ();      Day
  var hh = now.gethours ();      When
  var mm = Now.getminutes ();     cent
  var clock = year + "-";

  if (month <)
    clock + = "0";

  Clock + + month + "-";

  if (Day <)
    Clock + = "0";

  Clock = day + "";

  if (HH <)
    clock + = "0";

  Clock + = hh + ":";
  if (mm <) clock + = ' 0 ';
  Clock = mm;
  return (clock);
}

JS Gets the time difference function

Gets how many days of
time difference function getlasttime ()
  {
    var starttime=new Date ("1996-5-11 00:00");//start times
    var endtime= New Date ();  End Time
    var lasttime=endtime.gettime ()-starttime.gettime ()/////////() milliseconds///times

    difference number of days
    var days=math.floor ( lasttime/(24*3600*1000))

    //Calculate the number
    of hours var leave1=lasttime% (24*3600*1000)  //number of days after the calculation of the remaining milliseconds
    var hours= Math.floor (leave1/(3600*1000))
    //To calculate the number of minutes between
    var leave2=leave1% (3600*1000)    //The number of milliseconds remaining after calculation of
    var Minutes=math.floor (leave2/(60*1000))

    //Calculate the number
    of seconds between Var leave3=leave2% (60*1000)   //Count the remaining milliseconds
    after the number of minutes var seconds=math.round (leave3/1000) return

    "difference" +days+ "Days" +hours+ "hours" +minutes+ "minutes" +seconds+ "seconds";
  }

JS only automatically refresh page once

Automatically refresh the page once after stop refreshing
window.onload = function () {
  if (location.search.indexOf ("?") ==-1) {
   location.href = "? Myurl";
  }
  else{
   if (location.search.indexOf ("Myurl") ==-1) Location.href + = "&myurl";
  }
}

Ajax instances

$.ajax ({
    type: POST),
    URL: "join.php",
    data:datastring,
    success:function () {
      $ ('. Success '). FadeIn. Show ();
      $ ('. Error '). fadeout. Hide ();
    }
  });

Get window size in real time

$ (window). Resize (function () { 
  var height = $ (window). Height ();
  var width = $ (window). width ();
})

JS loop execution function and timed execution function

Loop execution, execute once every 3 seconds Showalert () 
  window.setinterval (Showalert, 3000);
  function Showalert ()
  {
    alert ("Loop Execution");
  }
  Scheduled execution, 5 seconds to execute show ()
  window.settimeout (show,5000);
   function Show ()
   {

    alert ("Timed execution");
   

JS gets get Parameter function

function getquerystring (name)
{
   var reg = new RegExp ("(^|&)" + name + "= ([^&]*) (&|$)");
   var r = window.location.search.substr (1). Match (reg);
   if (r!=null) return unescape (r[2]); return null;
}
Alert (getquerystring ("parameter name 1"));

JS Page Print Array function

 /**
  * Print Array
  * @param {[type]} arr the  array to be printed
  * @param {[type]} space controls the indentation of the print
  @param {[Type]} SPACE2 controls the printed Indent 2
  /function Print_arr (arr, space, Space2)
  {spaces

  = Space | | ' ';

  Space2 = Space2 | | '     ';

  var str = "array<br>" +space+ (<br>);

  for (var i=0; i<arr.length; i++)

  {

   if (Object.prototype.toString.call (arr[i)) = = ' [Object Array] ')

   { Determine if it is an array, and if so, perform a recursive concatenation of

    str = space2 + ' [' +i+ '] => ' + Print_arr (arr[i], space+ '   , space2+ '   );

   Else

   {

    str + + Space2 + ' [' +i+ '] => ' + arr[i] + ' <br>

   }

  } ' STR + + space+ ") <br>";

  document.write (str);

 

JS print JSON data array form output in HTML

/** output space function */function blank (num) {var res = ';
 for (var i = 0; i < num; i++) {res = ';
return res;
 /** calculate the number of JSON object data/function Jsonlen (jsonobj) {var length = 0;
 For (var item in jsonobj) {length++;
return length;
 /** Parse JSON object function * */function Printobj (obj) {//JSON object level depth deep = (typeof (deep) = = ' undefined ')? 0:deep; var html = "array\n";
 Returns HTML HTML + kong (deep) + "(\ n"; 
 var i = 0; JSON object, you cannot use. length to get the number of data, so you need to customize a calculation function var len = typeof (obj) = = ' array '?
 Obj.length:jsonLen (obj); for (var key in obj) {//To determine the data type, if it is an array or an object, the &&jsonlen (Obj[key]) is due to//1, when the value (similar to: email:) is null Hou, typeof (Obj[key]) will take this key as Object type//2, the value of NULL source is that some fields in the database table have no data, query directly into the JSON return to come back if (typeof (Obj[key)) = = ' Array ' | | (typeof (Obj[key]) = = ' object ' && Jsonlen (Obj[key]) > 0)
   {deep = 3;
   HTML + + KONG (deep) + ' [' + key + '] => ';
   Recursive call this function html = printobj (obj[key],deep); Deep-= 3;
  }else{HTML + KONG (deep + 3) + ' [' + key + '] => ' + obj[key] + ' \ n ';
  } if (i = = len-1) {html + KONG (deep) + ") \ n";
  };
 i++;
} return HTML;
 /** Append print JSON data to HTML page/function P_obj (Obj) {var div = document.getElementById (' print-json-html ');
 if (div!= null) {document.body.removeChild (div);
 };
 var node = document.createelement ("div");//Create a div tag node.id = ' print-json-html ';
 node.innerhtml = ' <pre> ' + printobj (obj) + ' </pre> ';
Document.body.appendChild (node); }

JS Print array length function of multidimensional array

Gets the number of multidimensional arrays
  function Getarrnum (arr) {

    var elenum = 0;

    if (arr = = null) {return

      0;

    }

    for (var i = 0; i < arr.length. i++) {for

      (var j = 0; J < Arr[i].length; J +) {

        elenum++;

      }

    }

    document.write (elenum);

  }

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