jquery属性的相关js实现方法

摘要: 有些公司手机网站开发不用第三方的jquery或者zeptio，直接用原生的javascript。原生javascript功能是蛮强大的，只不过部分属性不支持IE8以下浏览器。下面对jquery相关方法，如何用js来实现，做一些简单总结。

元素操作

Add Class

//JQUERY
$(el).addClass(className);

//js
//谷歌浏览器，火狐浏览器，IE8+
if (el.classList)
el.classList.add(className);
else
el.className += ' ' + className;
//谷歌浏览器，火狐浏览器，IE10+
el.classList.add(className);

After

//JQUERY
$(el).after(htmlString);

//js 谷歌浏览器，火狐浏览器，IE8+
el.insertAdjacentHTML('afterend', htmlString);

Append

//JQUERY
$(parent).append(el);

//js谷歌浏览器，火狐浏览器，IE8+
parent.appendChild(el);

Before

//JQUERY
$(el).before(htmlString);

//js谷歌浏览器，火狐浏览器，IE8+
el.insertAdjacentHTML('beforebegin', htmlString);

Children

//JQUERY
$(el).children();

//js
//谷歌浏览器，火狐浏览器，IE8+
var children = [];
for (var i = el.children.length; i--;) {
// Skip comment nodes on IE8
if (el.children[i].nodeType != 8)
children.unshift(el.children[i]);
}
//谷歌浏览器，火狐浏览器，IE9+
el.children

Clone

//JQUERY
$(el).clone();

//谷歌浏览器，火狐浏览器，IE8+
el.cloneNode(true);

Contains

//JQUERY
$.contains(el, child);

//谷歌浏览器，火狐浏览器，IE8+
el !== child && el.contains(child);

Contains Selector

//JQUERY
$(el).find(selector).length;

//谷歌浏览器，火狐浏览器，IE8+
el.querySelector(selector) !== null

Each

//JQUERY
$(selector).each(function(i, el){

});

//js谷歌浏览器，火狐浏览器，IE8+
function forEachElement(selector, fn) {
var elements = document.querySelectorAll(selector);
for (var i = 0; i < elements.length; i++)
fn(elements[i], i);
}

forEachElement(selector, function(el, i){

});
//js谷歌浏览器，火狐浏览器，IE9+
var elements = document.querySelectorAll(selector);
Array.prototype.forEach.call(elements, function(el, i){

});

Empty

//JQUERY
$(el).empty();

//js谷歌浏览器，火狐浏览器，IE8+
while(el.firstChild)
el.removeChild(el.firstChild);
//js谷歌浏览器，火狐浏览器，IE9+
el.innerHTML = '';

过滤filter

//JQUERY
$(selector).filter(filterFn);

//谷歌浏览器，火狐浏览器，IE8+
function filter(selector, filterFn) {
var elements = document.querySelectorAll(selector);
var out = [];
for (var i = elements.length; i--;) {
if (filterFn(elements[i]))
out.unshift(elements[i]);
}
return out;
}

filter(selector, filterFn);
//谷歌浏览器，火狐浏览器，IE9+
Array.prototype.filter.call(document.querySelectorAll(selector), filterFn);

查找子元素

//JQUERY
$(el).find(selector);

//谷歌浏览器，火狐浏览器，IE8+
el.querySelectorAll(selector);

查找、选择器

//JQUERY
$('.my #awesome selector');

//谷歌浏览器，火狐浏览器，IE8+
document.querySelectorAll('.my #awesome selector');

获取属性值attr

//JQUERY
$(el).attr('tabindex');

//谷歌浏览器，火狐浏览器，IE8+
el.getAttribute('tabindex');

获取Html内容

//JQUERY
$(el).html();

//js
el.innerHTML

获取CSS样式

//JQUERY
$(el).css(ruleName);

//谷歌浏览器，火狐浏览器，IE9+
getComputedStyle(el)[ruleName];

获取文本内容

//JQUERY
$(el).text();

//谷歌浏览器，火狐浏览器，IE8+
el.textContent || el.innerText
//谷歌浏览器，火狐浏览器，IE9+
el.textContent

Has Class

//JQUERY
$(el).hasClass(className);

//谷歌浏览器，火狐浏览器，IE8+
if (el.classList)
el.classList.contains(className);
else
new RegExp('(^| )' + className + '( |$)', 'gi').test(el.className);
//谷歌浏览器，火狐浏览器，IE10+
el.classList.contains(className);

元素比较

JQUERY
$(el).is($(otherEl));

//js
el === otherEl

比较类名

//JQUERY
$(el).is('.my-class');

//谷歌浏览器，火狐浏览器，IE8+
var matches = function(el, selector) {
var _matches = (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector);

if (_matches) {
return _matches.call(el, selector);
} else {
var nodes = el.parentNode.querySelectorAll(selector);
for (var i = nodes.length; i--;) {
if (nodes[i] === el)
return true;
}
return false;
}
};

matches(el, '.my-class');
//谷歌浏览器，火狐浏览器，IE9+
var matches = function(el, selector) {
return (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector).call(el, selector);
};

matches(el, '.my-class');

Next

//JQUERY
$(el).next();

//谷歌浏览器，火狐浏览器，IE8+
// nextSibling can include text nodes
function nextElementSibling(el) {
do { el = el.nextSibling; } while ( el && el.nodeType !== 1 );
return el;
}

el.nextElementSibling || nextElementSibling(el);
//谷歌浏览器，火狐浏览器，IE9+
el.nextElementSibling

Offset

//JQUERY
$(el).offset();
//js谷歌浏览器，火狐浏览器，IE8+
var rect = el.getBoundingClientRect()

{
top: rect.top + document.body.scrollTop,
left: rect.left + document.body.scrollLeft
}

Outer Width

//JQUERY
$(el).outerWidth();
//js
el.offsetWidth

Parent

//JQUERY
$(el).parent();
//js
el.parentNode

Position

//JQUERY
$(el).position();
//js
{left: el.offsetLeft, top: el.offsetTop}

Prev

//JQUERY
$(el).prev();
//谷歌浏览器，火狐浏览器，IE8+
// prevSibling can include text nodes
function previousElementSibling(el) {
do { el = el.previousSibling; } while ( el && el.nodeType !== 1 );
return el;
}

el.previousElementSibling || previousElementSibling(el);
//谷歌浏览器，火狐浏览器，IE9+
el.previousElementSibling

Remove

//JQUERY
$(el).remove();
//js谷歌浏览器，火狐浏览器，IE8+
el.parentNode.removeChild(el);

Remove Class

//JQUERY
$(el).removeClass(className);
//js谷歌浏览器，火狐浏览器，IE8+
if (el.classList)
el.classList.remove(className);
else
el.className = el.className.replace(new RegExp('(^|\\b)' + className.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');

//谷歌浏览器，火狐浏览器，IE10+
el.classList.remove(className);

Replace From Html

//JQUERY
$(el).replaceWith(string);
//谷歌浏览器，火狐浏览器，IE8+
el.outerHTML = string;

Set Attributes

//JQUERY
$(el).attr('tabindex', 3);
//谷歌浏览器，火狐浏览器，IE8+
el.setAttribute('tabindex', 3);

Set Html

//JQUERY
$(el).html(string);
//谷歌浏览器，火狐浏览器，IE8+
el.innerHTML = string;

Set Style

//JQUERY
$(el).css('border-width', '20px');
//谷歌浏览器，火狐浏览器，IE8+
// Use a class if possible
el.style.borderWidth = '20px';

Set Text

//JQUERY
$(el).text(string);
//谷歌浏览器，火狐浏览器，IE8+
if (el.textContent !== undefined)
el.textContent = string;
else
el.innerText = string;
//谷歌浏览器，火狐浏览器，IE9+
el.textContent = string;

Siblings

//JQUERY
$(el).siblings();
//谷歌浏览器，火狐浏览器，IE8+
var siblings = Array.prototype.slice.call(el.parentNode.children);

for (var i = siblings.length; i--;) {
if (siblings[i] === el) {
siblings.splice(i, 1);
break;
}
}
//谷歌浏览器，火狐浏览器，IE9+
Array.prototype.filter.call(el.parentNode.children, function(child){
return child !== el;
});

Toggle Class

//JQUERY
$(el).toggleClass(className);
//谷歌浏览器，火狐浏览器，IE8+
if (el.classList) {
el.classList.toggle(className);
} else {
var classes = el.className.split(' ');
var existingIndex = -1;
for (var i = classes.length; i--;) {
if (classes[i] === className)
existingIndex = i;
}

if (existingIndex >= 0)
classes.splice(existingIndex, 1);
else
classes.push(className);

el.className = classes.join(' ');
}
//谷歌浏览器，火狐浏览器，IE9+
if (el.classList) {
el.classList.toggle(className);
} else {
var classes = el.className.split(' ');
var existingIndex = classes.indexOf(className);

if (existingIndex >= 0)
classes.splice(existingIndex, 1);
else
classes.push(className);

el.className = classes.join(' ');
}
//谷歌浏览器，火狐浏览器，IE10+
el.classList.toggle(className);

事件

Off

//JQUERY
$(el).off(eventName, eventHandler);

//谷歌浏览器，火狐浏览器，IE8+
function removeEventListener(el, eventName, handler) {
if (el.removeEventListener)
el.removeEventListener(eventName, handler);
else
el.detachEvent('on' + eventName, handler);
}
removeEventListener(el, eventName, handler);

//谷歌浏览器，火狐浏览器，IE9+
el.removeEventListener(eventName, eventHandler);

On

//JQUERY
$(el).on(eventName, eventHandler);

//谷歌浏览器，火狐浏览器，IE8+
function addEventListener(el, eventName, handler) {
if (el.addEventListener) {
el.addEventListener(eventName, handler);
} else {
el.attachEvent('on' + eventName, function(){
handler.call(el);
});
}
}

addEventListener(el, eventName, handler);

谷歌浏览器，火狐浏览器，IE9+
el.addEventListener(eventName, eventHandler);

Ready

//JQUERY
$(document).ready(function(){

});

//谷歌浏览器，火狐浏览器，IE8+

function ready(fn) {
if (document.readyState != 'loading'){
fn();
} else if (document.addEventListener) {
document.addEventListener('DOMContentLoaded', fn);
} else {
document.attachEvent('onreadystatechange', function() {
if (document.readyState != 'loading')
fn();
});
}
}

//谷歌浏览器，火狐浏览器，IE9+

function ready(fn) {
if (document.readyState != 'loading'){
fn();
} else {
document.addEventListener('DOMContentLoaded', fn);
}

指定事件触发

//JQUERY
$(el).trigger('my-event', {some: 'data'});

//js谷歌浏览器，火狐浏览器，IE9+
if (window.CustomEvent) {
var event = new CustomEvent('my-event', {detail: {some: 'data'}});
} else {
var event = document.createEvent('CustomEvent');
event.initCustomEvent('my-event', true, true, {some: 'data'});
}

el.dispatchEvent(event);

Trigger Native

//JQUERY
$(el).trigger('change');

//谷歌浏览器，火狐浏览器，IE8+
if (document.createEvent) {
var event = document.createEvent('HTMLEvents');
event.initEvent('change', true, false);
el.dispatchEvent(event);
} else {
el.fireEvent('onchange');
}
//谷歌浏览器，火狐浏览器，IE9+
// For a full list of event types: https://developer.mozilla.org/en-US/docs/Web/API/document.createEvent var event = document.createEvent('HTMLEvents');
event.initEvent('change', true, false);
el.dispatchEvent(event);

技巧

Array Each

//JQUERY
$.each(array, function(i, item){

});

谷歌浏览器，火狐浏览器，IE8+
function forEach(array, fn) {
for (i = 0; i < array.length; i++)
fn(array[i], i);
}

forEach(array, function(item, i){

});

//谷歌浏览器，火狐浏览器，IE9+
array.forEach(function(item, i){

});

深度扩展

//JQUERY
$.extend(true, {}, objA, objB);
//谷歌浏览器，火狐浏览器，IE8+
var deepExtend = function(out) {
out = out || {};

for (var i = 1; i < arguments.length; i++) {
var obj = arguments[i];

if (!obj)
continue;

for (var key in obj) {
if (obj.hasOwnProperty(key)) {
if (typeof obj[key] === 'object')
deepExtend(out[key], obj[key]);
else
out[key] = obj[key];
}
}
}

return out;
};

deepExtend({}, objA, objB);

proxy

//JQUERY
$.proxy(fn, context);
//谷歌浏览器，火狐浏览器，IE8+
fn.apply(context, arguments);
//谷歌浏览器，火狐浏览器，IE9+
fn.bind(context);

bind

//jQuery
$.extend({}, objA, objB);
//谷歌浏览器，火狐浏览器，IE8+
var extend = function(out) {
out = out || {};

for (var i = 1; i < arguments.length; i++) {
if (!arguments[i])
continue;

for (var key in arguments[i]) {
if (arguments[i].hasOwnProperty(key))
out[key] = arguments[i][key];
}
}

return out;
};

extend({}, objA, objB);

Index Of

//JQUERY
$.inArray(item, array);
//谷歌浏览器，火狐浏览器，IE8+
function indexOf(array, item) {
for (var i = 0; i < array.length; i++) {
if (array[i] === item)
return i;
}
return -1;
}

indexOf(array, item);
谷歌浏览器，火狐浏览器，IE9+
array.indexOf(item);

Is Array

//JQUERY
$.isArray(arr);

//谷歌浏览器，火狐浏览器，IE8+
isArray = Array.isArray || function(arr) {
return Object.prototype.toString.call(arr) == '[object Array]';
}

isArray(arr);
//谷歌浏览器，火狐浏览器，IE9+
Array.isArray(arr);

Map

//JQUERY
$.map(array, function(value, index){

});

//js谷歌浏览器，火狐浏览器，IE8+
function map(arr, fn) {
var results = [];
for (var i = 0; i < arr.length; i++)
results.push(fn(arr[i], i));
return results;
}

map(array, function(value, index){

});
//谷歌浏览器，火狐浏览器，IE9+
array.map(function(value, index){

});

Now

//JQUERY
$.now();

//谷歌浏览器，火狐浏览器，IE8+
new Date().getTime();
//谷歌浏览器，火狐浏览器，IE9+
Date.now();

Parse Html

//JQUERY
$.parseHTML(htmlString);

谷歌浏览器，火狐浏览器，IE8+
var parseHTML = function(str) {
var el = document.createElement('div');
el.innerHTML = str;
return el.children;
};

parseHTML(htmlString);
谷歌浏览器，火狐浏览器，IE9+
var parseHTML = function(str) {
var tmp = document.implementation.createHTMLDocument();
tmp.body.innerHTML = str;
return tmp.body.children;
};

parseHTML(htmlString);

解析 Json

//JQUERY
$.parseJSON(string);
//谷歌浏览器，火狐浏览器，IE8+
JSON.parse(string);

Trim

//JQUERY
$.trim(string);
//谷歌浏览器，火狐浏览器，IE8+
string.replace(/^\s+|\s+$/g, '');
//谷歌浏览器，火狐浏览器，IE9+
string.trim();

Type

//JQUERY
$.type(obj);

谷歌浏览器，火狐浏览器，IE8+
Object.prototype.toString.call(obj)
.replace(/^\[object (.+)\]$/, "$1")
.toLowerCase();

ajax

新AJAX方法fetch()

基本Fetch用法

让我们先用一个例子来比较一下使用 XMLHttpRequest 和使用 fetch 之间的不同。我们要请求一个URL，获取JSON格式的返回结果。

原来的XMLHttpRequest

一个 XMLHttpRequest 请求需要两个监听器来捕捉 success 和 error 两种情形，而且需要调用 open() 和 send() 方法。

function reqListener() {
var data = JSON.parse(this.responseText);
console.log(data);
}

function reqError(err) {
console.log('Fetch Error :-S', err);
}

var oReq = new XMLHttpRequest();
oReq.onload = reqListener;
oReq.onerror = reqError;
oReq.open('get', './api/some.json', true);
oReq.send();

Fetch方法：

我们的 fetch 请求的代码基本上是这样的：

fetch('./api/some.json')
.then(
function(response) {
if (response.status !== 200) {
console.log('Looks like there was a problem. Status Code: ' +
response.status);
return;
}

// Examine the text in the response
response.json().then(function(data) {
console.log(data);
});
}
)
.catch(function(err) {
console.log('Fetch Error :-S', err);
});

用fetch执行表单数据提交

在WEB应用中，提交表单是非常常见的操作，用fetch来提交表单数据也是非常简洁。

fetch里提供了 method 和 body 参数选项。

fetch(url, {
method: 'post',
headers: {
"Content-type": "application/x-www-form-urlencoded; charset=UTF-8"
},
body: 'foo=bar&lorem=ipsum'
})
.then(json)
.then(function (data) {
console.log('Request succeeded with JSON response', data);
})
.catch(function (error) {
console.log('Request failed', error);
});

在Fetch请求里发送用户身份凭证信息

如果你想在fetch请求里附带cookies之类的凭证信息，可以将 credentials 参数设置成 “include” 值。

fetch(url, {
credentials: 'include'
})

JSON

//JQUERY
$.getJSON('/my/url', function(data) {

});

//谷歌浏览器，火狐浏览器，IE8+
var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onreadystatechange = function() {
if (this.readyState === 4) {
if (this.status >= 200 && this.status < 400) {
// Success!
var data = JSON.parse(this.responseText);
} else {
// Error :(
}
}
};

request.send();
request = null;

//谷歌浏览器，火狐浏览器，IE9+
var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onload = function() {
if (request.status >= 200 && request.status < 400) {
// Success!
var data = JSON.parse(request.responseText);
} else {
// We reached our target server, but it returned an error

}
};

request.onerror = function() {
// There was a connection error of some sort
};

request.send();

//谷歌浏览器，火狐浏览器，IE10+
var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onload = function() {
if (this.status >= 200 && this.status < 400) {
// Success!
var data = JSON.parse(this.response);
} else {
// We reached our target server, but it returned an error

}
};

request.onerror = function() {
// There was a connection error of some sort
};

request.send();

Post

//JQUERY
$.ajax({
type: 'POST',
url: '/my/url',
data: data
});

//谷歌浏览器，火狐浏览器，IE8+
var request = new XMLHttpRequest();
request.open('POST', '/my/url', true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.send(data);

Request

//JQUERY
$.ajax({
type: 'GET',
url: '/my/url',
success: function(resp) {

},
error: function() {

}
});

//谷歌浏览器，火狐浏览器，IE8+
var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onreadystatechange = function() {
if (this.readyState === 4) {
if (this.status >= 200 && this.status < 400) {
// Success!
var resp = this.responseText;
} else {
// Error :(
}
}
};

request.send();
request = null;

//谷歌浏览器，火狐浏览器，IE9+
var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onload = function() {
if (request.status >= 200 && request.status < 400) {
// Success!
var resp = request.responseText;
} else {
// We reached our target server, but it returned an error

}
};

request.onerror = function() {
// There was a connection error of some sort
};

request.send();

//谷歌浏览器，火狐浏览器，IE10+
var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onload = function() {
if (this.status >= 200 && this.status < 400) {
// Success!
var resp = this.response;
} else {
// We reached our target server, but it returned an error

}
};

request.onerror = function() {
// There was a connection error of some sort
};

request.send();

特效

淡入淡出

//JQUERY
$(el).fadeIn();

//谷歌浏览器，火狐浏览器，IE8+
function fadeIn(el) {
var opacity = 0;

el.style.opacity = 0;
el.style.filter = '';

var last = +new Date();
var tick = function() {
opacity += (new Date() - last) / 400;
el.style.opacity = opacity;
el.style.filter = 'alpha(opacity=' + (100 * opacity)|0 + ')';

last = +new Date();

if (opacity < 1) {
(window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16);
}
};

tick();
}

fadeIn(el);

//谷歌浏览器，火狐浏览器，IE9+
function fadeIn(el) {
el.style.opacity = 0;

var last = +new Date();
var tick = function() {
el.style.opacity = +el.style.opacity + (new Date() - last) / 400;
last = +new Date();

if (+el.style.opacity < 1) {
(window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16)
}
};

tick();
}

fadeIn(el);

//谷歌浏览器，火狐浏览器，IE10+
el.classList.add('show');
el.classList.remove('hide');
.show {
transition: opacity 400ms;
}
.hide {
opacity: 0;
}

Hide

//JQUERY
$(el).hide();

//谷歌浏览器，火狐浏览器，IE8+
el.style.display = 'none';

Show

//JQUERY
$(el).show();
//谷歌浏览器，火狐浏览器，IE8+
el.style.display = '';