Javascript类返回数组,创建类似jQuery的库 [英] Javascript Class return array, create library like jQuery
问题描述
我正在创建像jQuery这样的javascript库,我已经成功添加了原型html()
,但是如果我用$(selector)
调用它,它会返回像{'el' : [array]}
这样的对象,如果将函数更改为return this.el;
,它会返回数组,但是我不能拨打.html()
.
I'm creating javascript library like jQuery, I have successfully adding prototype html()
but if I call it with $(selector)
it return object like {'el' : [array]}
and if change in function to return this.el;
it return array but I can't call .html()
.
如何在不破坏原型的情况下返回[array]
?
How it can return [array]
instead without breaking prototype?
window.$ = function(selector) {
if (!(this instanceof $)) {
return new $(selector);
}
this.el = [];
this.html = function(str) {
this.el.forEach(function(el) {
el.innerHTML = str;
});
};
(function(self) {
for (var eList = document.querySelectorAll(selector), i = eList.length - 1; i > -1; i--) {
self.el[i] = eList[i];
}
})(this);
return this;
};
$('#test').html('BBBBB')
console.log($('#test')[0])
<div id="test">AAAAAAA</div>
推荐答案
最后通过查看Zepto
源代码解决了,将对象转换为数组的神奇之处在于必须创建$.prototype.splice
,它是从
finally it solved by looking Zepto
source code, the magic to convert object to array is you have to create $.prototype.splice
, it copied from the Array.splice
// only load if no jQuery on the page
if (window.$ === undefined) window.$ = (function () {
var $, zepto = {}, emptyArray = [];
function Z(dom, selector) {
var i, len = dom ? dom.length : 0;
for (i = 0; i < len; i++) this[i] = dom[i];
this.length = len;
this.selector = selector || '';
}
Z.prototype = {
splice: emptyArray.splice,
forEach: emptyArray.forEach,
html: function (str) {
this.forEach(function (el) {
el.innerHTML = str;
});
}
};
zepto.Z = function (dom, selector) {return new Z(dom, selector);};
zepto.init = function (selector, context) {
if (!selector) return zepto.Z();
var dom = document.querySelectorAll(selector);
return zepto.Z(dom, selector);
};
$ = function (sel, ctx) {return zepto.init(sel, ctx); };
return $;
})();
$('.test').html('DDDDD');
console.log($('.test'));
<div class="test"> AAAA </div>
<div class="test"> BBBB </div>
<div class="test"> CCCC </div>
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