JQuery 获取Dom元素的实例讲解

废话不多说，直接上代码

(function (window) {
var arr = [];
var vp = function (selector, context) {
return new vp.fn.init(selector, context);
}
vp.fn = vp.prototype = {
constructor: vp,
init: function (selector, context) {
var _document = window.document, elem, mark = selector.charat(0);
if (mark == '#') {
elem = _document.getelementbyid(selector.substring(1));
if (elem) {
this[0] = elem;
this.length = 1;
}
}
return this;
},
splice: arr.splice,
};
vp.extend = vp.fn.extend = function () {
var options, name, src, copy, copyisarray, clone,
target = arguments[0] || {},
i = 1,
length = arguments.length,
deep = false;
if (typeof target === "boolean") {
deep = target;
target = arguments[i] || {};
i++;
}
if (typeof target !== "object" && !vp.isfunction(target)) {
target = {};
}
if (i === length) {
target = this;
i--;
}
for (; i < length; i++) {
if ((options = arguments[i]) != null) {
for (name in options) {
src = target[name];
copy = options[name];
if (target === copy) {
continue;
}
if (deep && copy && (vp.isplainobject(copy) ||
(copyisarray = vp.isarray(copy)))) {
if (copyisarray) {
copyisarray = false;
clone = src && vp.isarray(src) ? src : [];
} else {
clone = src && vp.isplainobject(src) ? src : {};
}
target[name] = vp.extend(deep, clone, copy);
} else if (copy !== undefined) {
target[name] = copy;
}
}
}
}
return target;
};
vp.fn.extend({

get: function () {
return this[0];
},


});
vp.fn.init.prototype = vp.fn;
window.vp = vp;
})(window);

以上这篇jquery 获取dom元素的实例讲解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。