jQuery的Safari浏览器慢于Chrome / Firefox [英] jQuery's .each slower on Safari than Chrome/Firefox

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问题描述

我有一个大的HTML表格(1,000-1,500行,40列宽)。我有几个输入和选择框,以便用户可以过滤行。相关的javascript / jquery(注意:并非整个代码库被粘贴,因为它不是瓶颈)附加到它看起来像:

  function autoRank(){
//自动编号
等级= 0;
$(#myTablePlayers .playerData)。each(function(){
if($(this).css(display)!=none){
rank ++;
$(this).find('td')。eq(colRank).text(rank);
}
});


var teamCols = $(),
GPCols = $(),
posCols = $(),
ageCols = $();

$(#myTablePlayers .playerData)。each(function(){
var columns = $(this).find('td');
teamCols = teamCols (col。);
posCols = posCols.add(columns.eq(colPos)); .add($(。colTeam
ageCols = ageCols.add(columns.eq(colAge))
});
$ b函数filterTable(){
//需要一些错误检查输入不是数字
minGP = $(#mingp)。val()
teams = $(#teamFilter)。val()。toUpperCase()
position = $(#position)。val()
age = $(#age)。val()

$(#myTablePlayers .playerData)。show();
$ b $ *循环检查团队* /
if(teams){
teamCols.each(function(){
if(!this.innerHTML。 toUpperCase()。includes(teams)){
$(this).parent()。hide();
}
});

$ b $ *循环并检查最小GP * /
GPCols.each(function(){
if(Number(this.innerHTML)< minGP ){
$(this).parent()。hide();
}
}); (年龄){
年龄=数量(年龄)
ageCols.each(函数(){$ b $)
$ b $ / *检查年龄要求* /
b thisAge = Number(this.innerHTML);
if(thisAge< age || thisAge> = age + 1){
$(this).parent()。hide();
}
});

$ b $ *检查头寸要求* /
if(position){
posCols.each(function(){
var thisPos = this .innerHTML
if(position ==D){
if(thisPos.indexOf(D)== -1){
$(this).parent()。hide ();
}
} else if(position ==F){
if(thisPos.indexOf(D)!= -1){
$(这个).parent()。hide();
}
} else if(thisPos!= position){
$(this).parent()。hide();
}
});
}

autoRank();
}

在尽可能少地剥离代码时,违规代码是

  var.each(function(){... 


filterTable()函数中。在Chrome或Firefox上运行它会很快运行(小于1秒),并且DOM呈现正确。当我在Safari上执行时,它需要30秒以上。



为什么会这样我能做些什么来适应这个浏览器?




jQuery:1.11.1(甚至在升级到3.1 .1)。
$ b Safari:10.0.1

Firefox:50

Chrome:54.0。

$

解决方案

从代码中删除所有重复和不必要的复杂事件后, pre> var colRank = 0,colTeam = 1,colGP = 2,colAge = 3,colPos = 4;

函数filterTable(){
var minGP = + $(#mingp)。val();
var age = + $(#age)。val();
var teams = $(#teamFilter)。val()。toUpperCase();
var position = $(#position)。val();
var rank = 0;

$(#myTablePlayers .playerData)。each(function(){
if(
(teams&& this.cells [colTeam] .textContent.toUpperCase ().includes(teams))||
(minGP&& + this.cells [colGP] .textContent< minGP)||
(age&&(+ this.cells [colAge] .textContent< age || + this.cells [colAge] .textContent> = age + 1))||
((position ===D|| position ===F )&& amp; this.cells [colPos] .textContent.indexOf(position)=== -1)||
(!(position ===D|| position ===F )&&(this.cells [colPos] .textContent!== position))
){
this.cells [colRank] .textContent = ++ rank;
this.style .display =;
} else {
this.style.display =none;
}
});
}

我已经删除了几乎所有jQuery,以支持本地DOM操作。 / p>

剩下的 .each()可以被调整为一个普通的旧的 c $ c>循环遍历 document.getElementById('myTablePlayers')。tBody [0] .rows ,如果你想排除最后一点可能的表现。 / p>

如果条件通过似然性重新排序:从通常会筛选出最多行到最后一行过滤出最少的行。因为JS短路条件,这种方式更少的条件进行总体检查。



制作 table display:fixed 也可以提高渲染性能,但会降低灵活性。



最后,您可以使用 CSS来做计数器。这可能比手动设置表格单元的内容要快。为自己测试。

I have a large HTML table (1,000-1,500 rows, 40 cols wide). I have a few input and select boxes so users can filter rows. The relevant javascript/jquery (note: not entire code base is pasted in as it is not the bottleneck) attached to it looks like:

function autoRank() {
    // auto number
    rank = 0;
    $("#myTablePlayers .playerData").each(function() {
        if ($(this).css("display") != "none") {
            rank++;
            $(this).find('td').eq(colRank).text(rank);
        }
    });
}

var teamCols = $(),
    GPCols = $(),
    posCols = $(),
    ageCols = $();

$("#myTablePlayers .playerData").each(function() {
  var columns = $(this).find('td');
  teamCols = teamCols.add($(".colTeam", this));
  GPCols = GPCols.add(columns.eq(colGP));
  posCols = posCols.add(columns.eq(colPos));
  ageCols = ageCols.add(columns.eq(colAge))
});

function filterTable() {
    // Need some error checking on input not number
    minGP = $("#mingp").val()
    teams = $("#teamFilter").val().toUpperCase()
    position = $("#position").val()
    age = $("#age").val()

    $("#myTablePlayers .playerData").show();

    /* Loop through to check for teams */
    if (teams) {
      teamCols.each(function() {
        if (!this.innerHTML.toUpperCase().includes(teams)) {
          $(this).parent().hide();
        }
      });
    }

    /* Loop and check for min GP */
    GPCols.each(function() {
      if ( Number(this.innerHTML) < minGP) {
        $(this).parent().hide();
      }
    });

    /* Check for age requirement */
    if (age) {
      age = Number(age)
      ageCols.each(function() {
        thisAge = Number(this.innerHTML);
        if ( thisAge < age || thisAge >= age+1 ) {
          $(this).parent().hide();
        }
      });
    }

    /* Check the position requirement */
    if (position) {
      posCols.each(function() {
        var thisPos = this.innerHTML
        if (position == "D") {
          if (thisPos.indexOf("D") == -1) {
            $(this).parent().hide();
          }
        } else if (position == "F") {
          if (thisPos.indexOf("D") != -1) {
            $(this).parent().hide();
          }
        } else if (thisPos != position) {
          $(this).parent().hide();
        }
      });
    }

    autoRank();
}

When stripping down the code as minimal as possible, the offending code is the

var.each(function() { ...

in the filterTable() function.

When I run this on Chrome or Firefox it runs quickly (sub 1 second) and the DOM is rendered properly. When I execute on Safari it takes 30+ seconds.

Why is this and what can I do to adapt for this browser?


jQuery: 1.11.1 (same issue even after upgrading to 3.1.1).

Safari: 10.0.1
Firefox: 50
Chrome: 54.0.

解决方案

After removing all the repetition and unnecessary complication from your code, this is what remains:

var colRank = 0, colTeam = 1, colGP = 2, colAge = 3, colPos = 4;

function filterTable() {
    var minGP = +$("#mingp").val();
    var age = +$("#age").val();
    var teams = $("#teamFilter").val().toUpperCase();
    var position = $("#position").val();
    var rank = 0;

    $("#myTablePlayers .playerData").each(function () {
        if (
            (teams && this.cells[colTeam].textContent.toUpperCase().includes(teams)) ||
            (minGP && +this.cells[colGP].textContent < minGP) ||
            (age && (+this.cells[colAge].textContent < age || +this.cells[colAge].textContent >= age+1)) ||
            ((position === "D" || position === "F") && this.cells[colPos].textContent.indexOf(position) === -1) ||
            (!(position === "D" || position === "F") && (this.cells[colPos].textContent !== position))
        ) {
            this.cells[colRank].textContent = ++rank;
            this.style.display = "";
        } else {
            this.style.display = "none";
        }
    });
}

I've already removed almost all jQuery in favor of native DOM manipulation.

The remaining .each() could be tuned into a plain old for loop over the document.getElementById('myTablePlayers').tBodies[0].rows, if you want to squeeze out the last bit of possible performance.

Reorder the if conditions by likeliness: From the one that will typically filter out the most rows to the one that will filter out the least rows. Because JS short-circuits conditions, this way less conditions are checked overall.

Making the table display: fixed can also improve render performance at the expense of flexibility.

Finally, you can use CSS to do counters. This is probably faster than manually setting the contents of a table cell. Test for yourself.

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