.trigger() 与 .click() 中的 jQuery 优势/差异
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jQuery advantages/differences in .trigger() vs .click()
提问by benhowdle89
In terms of performance, what are the gains (or just differences) between:
在性能方面，以下之间的收益（或只是差异）是什么：
$('.myEl').click();
and
和
$('.myEl').trigger('click');
Are there any at all?
有吗？
采纳答案by andlrc
This is the code for the clickmethod:
jQuery.fn.click = function (data, fn) {
if (fn == null) {
fn = data;
data = null;
}
return arguments.length > 0 ? this.on("click", null, data, fn) : this.trigger("click");
}
as you can see; if no arguments are passed to the function it will trigger the click event.
如你看到的; 如果没有参数传递给函数，它将触发点击事件。
Using .trigger("click")will call one less function.
使用.trigger("click")将调用少一个函数。
And as @Sandeep pointed out in his answer.trigger("click")is faster:
正如@Sandeep 在他的回答中指出的那样.trigger("click")更快：
As of 1.9.0 the check for dataand fnhas been moved to the .onfunction:
$.fn.click = function (data, fn) {
return arguments.length > 0 ? this.on("click", null, data, fn) : this.trigger("click");
}
回答by Nicola Peluchetti
i think that
我觉得
$('.myEl').trigger('click');
is better because it saves you a function call as $('.myEl').click();just calls that funciton. Look at the code from jQuery source
更好，因为它为您节省了函数调用，$('.myEl').click();就像调用该函数一样。查看来自jQuery源的代码
jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
"mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
"change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {
// Handle event binding
jQuery.fn[ name ] = function( data, fn ) {
if ( fn == null ) {
fn = data;
data = null;
}
return arguments.length > 0 ?
this.on( name, null, data, fn ) :
//here they call trigger('click'); if you provide no arguments
this.trigger( name );
};
if ( jQuery.attrFn ) {
jQuery.attrFn[ name ] = true;
}
if ( rkeyEvent.test( name ) ) {
jQuery.event.fixHooks[ name ] = jQuery.event.keyHooks;
}
if ( rmouseEvent.test( name ) ) {
jQuery.event.fixHooks[ name ] = jQuery.event.mouseHooks;
}
});
回答by sandeep
for performance kind .check here.. http://jsperf.com/trigger-vs-not-triggerBoth are almost same...click() is shorthand of trigger('click').
对于性能种类。在这里检查.. http://jsperf.com/trigger-vs-not-trigger两者几乎相同...click() 是 trigger('click') 的简写。
回答by Pawel Zubrycki
Check http://api.jquery.com/click/:
检查http://api.jquery.com/click/：
In the third variation, when .click() is called without arguments, it is a shortcut for .trigger("click").
在第三种变体中，当不带参数调用 .click() 时，它是 .trigger("click") 的快捷方式。
It seems they are the same.
似乎他们是一样的。
