[英]jQuery chaining performance
Are these equivalent in term of speed ? 这些在速度方面是否相同?
$(this).attr("date",date);
$(this).attr("date_start",date_start);
$(this).attr("heure_start",heure_start);
or 要么
$(this).attr("date",date).attr("date_start",date_start).attr("heure_start",heure_start);
Even if the second is faster is it better to write it separate to make the code more readable? 即使第二个更快,最好将它单独编写以使代码更具可读性?
No, the two aren't equivalent in speed. 不,这两者在速度上并不相同。
$(this)
builds a new jQuery object each time. $(this)
每次都构建一个新的jQuery对象。 And depending on what is this
, this can be a complex operation. 并根据什么是
this
,这是一个复杂的操作。
So the second form is faster. 所以第二种形式更快。
Note that for readibility you can write it as 请注意,为了便于阅读,您可以将其编写为
$(this)
.attr("date",date)
.attr("date_start",date_start)
.attr("heure_start",heure_start);
If you can't chain the operations because you have other lines of code in between, you can also cache the object. 如果由于中间有其他代码行而无法链接操作,则还可以缓存该对象。 This is usual :
这通常是:
var $this = $(this);
$this.attr("date", date);
$this.attr("date_start", date_start);
$this.attr("heure_start", heure_start);
And note also that attr can take a map as argument : 还要注意attr可以将地图作为参数:
$(this).attr({
date: date,
date_start: date_start,
heure_start: heure_start
});
For readability purposes you could split the line to 出于可读性目的,您可以将行拆分为
$(this)
.attr("date",date)
.attr("date_start",date_start)
.attr("heure_start",heure_start);
I know this should have been a comment but the spacing would have made no sense as one. 我知道这应该是一个评论,但是间距本来就没有意义。
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