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Zepto源代码分析之二~三个API
};
* $.contains(parent, node);
* 检查父节点是否包括给定的dom节点，假设两者是同样节点，返回false
* return {boolean} true/false
*/
回调函数返回false时停止遍历。
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta charset="utf-8" />
<title>Zepto源代码分析</title>
<link rel="stylesheet" href="http://www.mamicode.com/demo.css" type="text/css" />
</head>
<body>
<div id="test">
測试zepto源代码
<span class="aa">22</span>
<span class="bb">2332</span>
</div>
<div class="wrap">content</div>
<script src="http://www.mamicode.com/zepto-dev.js"></script>
<script>
console.log($(‘div‘));
console.log($(‘.aa‘));
console.log($(‘<div>这是測试内容</div>‘));
console.log($("<span />", { text: "測试測试111", id: "ceshi_111", css: { color: ‘red‘ } }));
Zepto(function($) {
console.log(‘Ready to Zepto!‘);
});
</script>
<script>
console.log($.camelCase(‘hello-there-body‘));
console.log($.contains($(‘#test‘)[0], $(‘.aa‘)[0]));
$.each([‘a‘, ‘b‘, ‘c‘], function(index, item) {
console.log(‘item %d is: %s‘, index, item);
});
var hash = { name: ‘zepto-dev.js‘, size: ‘micro‘ };
$.each(hash, function(key, value) {
console.log(‘%s: %s‘, key, value);
});
</script>
</body>
</html>
/**
* 变量初始化
*/
var $;
var zepto = {};
var fragmentRE = /^\s*<(\w+|!)[^>]*>/;
var singleTagRE = /^<(\w+)\s*\/?>(?:<\/\1>|)$/;
var tagExpanderRE = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/ig;
var undefined;
var emptyArray = [];
var slice = emptyArray.slice;
var cssNumber = {
‘column-count‘: 1,
‘columns‘: 1,
‘font-weight‘: 1,
‘line-height‘: 1,
‘opacity‘: 1,
‘z-index‘: 1,
‘zoom‘: 1
};
// 特殊属性集合
var methodAttributes = [ ‘val‘, ‘css‘, ‘html‘, ‘text‘, ‘data‘, ‘width‘, ‘height‘, ‘offset‘ ];
var table = document.createElement(‘table‘);
var tableRow = document.createElement(‘tr‘);
var containers = {
‘tr‘: document.createElement(‘tbody‘),
‘tbody‘: table,
‘thead‘: table,
‘tfoot‘: table,
‘td‘: tableRow,
‘th‘: tableRow,
‘*‘: document.createElement(‘div‘)
};
var readyRE = /complete|loaded|interactive/;
var simpleSelectorRE = /^[\w-]*$/;
var class2type = {};
var toString = class2type.toString;
var camelize;
var isArray = Array.isArray || function(object) {
return object instanceof Array;
};
/**
* 检測函数
*/
function type(obj) {
return obj == null ? String(obj) :
class2type[toString.call(obj)] || "object";
}
function isFunction(value) {
return type(value) == "function";
}
function isWindow(obj) {
return obj != null && obj == obj.window;
}
function isDocument(obj) {
return obj != null && obj.nodeType == obj.DOCUMENT_NODE;
}
function isObject(obj) {
return type(obj) == "object";
}
function isPlainObject(obj) {
return isObject(obj) && !isWindow(obj) && Object.getPrototypeOf(obj) == Object.prototype;
}
function likeArray(obj) {
return typeof obj.length == ‘number‘;
}
/**
* 字符串替换
* 使用replace第二个參数带回调
*/
function camelize(str) {
return str.replace(/-+(.)?/g,
function(match, chr) {
console.log(chr);
return chr ? chr.toUpperCase() : ‘‘;
}
);
}
function dasherize(str) {
return str.replace(/::/g, ‘/‘)
.replace(/([A-Z]+)([A-Z][a-z])/g, ‘$1_$2‘)
.replace(/([a-z\d])([A-Z])/g, ‘$1_$2‘)
.replace(/_/g, ‘-‘)
.toLowerCase()
}
function maybeAddPx(name, value) {
return (typeof value =http://www.mamicode.com/="number" && !cssNumber[dasherize(name)]) ?
value + "px" : value;
}
/**
* `$.zepto.fragment`须要一个html字符串和一个可选标记名来生成dom
* 产生的dom返回一个数组形式
* 该功能能够被插件覆盖
* 没有覆盖全部浏览器
*/
zepto.fragment = function(html, name, properties) {
var dom;
var nodes;
var container;
// 标签特殊化处理
if (singleTagRE.test(html)) {
dom = $(document.createElement(RegExp.$1));
}
if (!dom) {
if (html.replace) {
html = html.replace(tagExpanderRE, "<$1></$2>");
}
if (name === undefined) {
name = fragmentRE.test(html) && RegExp.$1;
}
if (!(name in containers)) {
name = ‘*‘;
}
container = containers[name];
container.innerHTML = ‘‘ + html;
dom = $.each(slice.call(container.childNodes), function() {
container.removeChild(this);
});
}
if (isPlainObject(properties)) {
nodes = $(dom);
$.each(properties, function(key, value) {
if (methodAttributes.indexOf(key) > -1) {
nodes[key](value);
}
else {
nodes.attr(key, value);
}
});
}
return dom;
};
/**
* `$.zepto.Z`将给定`dom`节点数组的原型赋上`$.fn`提供的全部Zepto函数
* 请注意。`__proto__`不支持IE浏览器
*/
zepto.Z = function(dom, selector) {
dom = dom || [];
dom.__proto__ = $.fn;
dom.selector = selector || ‘‘;
return dom;
};
/**
* `$.zepto.isZ`检查给定的对象是一个Zepto的集合，可被插件覆盖
*/
zepto.isZ = function(object) {
return object instanceof zepto.Z;
};
/**
* `$.zepto.init`是Zepto借鉴jQuery的`$.fn.init`方法
* 採用css选择器和一个可选的上下文（处理各种特殊情况）
* 该方法可被插件覆盖
*/
zepto.init = function(selector, context) {
// 假设没有给出，返回一个空的Zepto集合
if (!selector) {
return zepto.Z();
}
// 检測字符串类型
else if (typeof selector == ‘string‘) {
selector = selector.trim();
/**
* 假设是一个HTML片段，创建节点注意，在chrome21和FF15版本号。
* DOM错误12不是以<被抛出
*/
if (selector[0] == ‘<‘ && fragmentRE.test(selector)) {
dom = zepto.fragment(selector, RegExp.$1, context);
selector = null;
// 假设存在一个上下文环境，建立收集。并从中选择节点
} else if (context !== undefined) {
return $(context).find(selector);
// 假设是一个css选择器。用它来选择节点
} else {
dom = zepto.qsa(document, selector);
}
// 假设一个函数存在，在domready就绪后触发
} else if (isFunction(selector)) {
return $(document).ready(selector);
}
// 假设zepto已经收集给出，直接返回
else if (zepto.isZ(selector)) {
return selector;
} else {
// 假设节点已经为数组，进行聚合
if (isArray(selector)) {
dom = compact(selector);
}
// 包装DOM节点
else if (isObject(selector)) {
dom = [selector];
selector = null;
}
// 假设是一个HTML片段，对该片段创建节点
else if (fragmentRE.test(selector)) {
dom = zepto.fragment(selector.trim(), RegExp.$1, context);
selector = null;
}
// 假设存在上下文环境，先建立收集。并从中选择节点
else if (context !== undefined) {
return $(context).find(selector);
}
// 假设是一个css选择器。用它来选择节点
else {
dom = zepto.qsa(document, selector);
}
}
// 对发现的节点创建一个新的Zepto集合
return zepto.Z(dom, selector);
};
// `$`作为Zepto的元对象。当调用`$`该函数将转由`$.zepto.init`处理
$ = function(selector, context) {
return zepto.init(selector, context);
};
/**
* `$.zepto.qsa`是Zepto的css选择器，使用document.querySelectorAll及特殊情况
* 可被插件覆盖
*/
zepto.qsa = function(element, selector) {
var found;
var maybeID = (selector[0] == ‘#‘);
var maybeClass = !maybeID && selector[0] == ‘.‘;
// 确认下标从1開始后的字符串
var nameOnly = maybeID || maybeClass ?
selector.slice(1) : selector;
var isSimple = simpleSelectorRE.test(nameOnly);
return (isDocument(element) && isSimple && maybeID) ?
((found = element.getElementById(nameOnly)) ? [found] : []) :
slice.call((isSimple && !maybeID) ?
maybeClass ?
element.getElementsByClassName(nameOnly) : // class名称
element.getElementsByTagName(selector) : // tag名称
element.querySelectorAll(selector) // 查询全部匹配到的
);
};
/**
* $.contains(parent, node); 演示样例$.contains($(‘#test‘)[0], $(‘.aa‘)[0])
* 检查父节点是否包括给定的dom节点，假设两者是同样节点，返回false
* return {boolean} true/false
*/
$.contains = document.documentElement.contains ?
function (parent, node) {
return parent !== node && parent.contains(node);
} :
function (parent, node) {
while (node && (node = node.parentNode)) {
if (node === parent) {
return true;
}
}
return false;
};
function setAttribute(node, name, value) {
value =http://www.mamicode.com/= null ? node.removeAttribute(name) : node.setAttribute(name, value);
}
// 函数參数
function funcArg(context, arg, idx, payload) {
return isFunction(arg) ? arg.call(context, idx, payload) : arg;
}
$.type = type;
$.isFunction = isFunction;
$.isWindow = isWindow;
$.isArray = isArray;
$.isPlainObject = isPlainObject;
$.camelCase = camelize;
/**
* Zepto对象迭代器
* @param {object|array} elements 数据对象
* @param {function} callback 回调函数
* return {object|array} elements 数据对象
*/
$.each = function(elements, callback) {
var i;
var key;
// 数组检測
if (likeArray(elements)) {
for (i = 0; i < elements.length; i++) {
if (callback.call(elements[i], i, elements[i]) === false) {
return elements;
}
}
} else {
for (key in elements) {
if (callback.call(elements[key], key, elements[key]) === false) {
return elements;
}
}
}
return elements;
};
// 配置类型映射
$.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
class2type["[object " + name + "]"] = name.toLowerCase();
});
/**
* 定义的方法，适用于全部的Zepto对象
*/
$.fn = {
ready: function(callback) {
// 检查document.body存在且文档渲染完毕
if (readyRE.test(document.readyState) && document.body) {
callback($);
} else {
document.addEventListener(‘DOMContentLoaded‘, function() {
callback($);
}, false);
}
},
each: function(callback) {
emptyArray.every.call(this, function(el, idx) {
return callback.call(el, idx, el) !== false;
});
return this;
},
text: function(text) {
return 0 in arguments ?
this.each(function(idx) {
var newText = funcArg(this, text, idx, this.textContent);
this.textContent = (newText == null) ? ‘‘ : ‘‘ + newText;
}) :
(0 in this ? this[0].textContent : null);
},
attr: function(name, value) {
var result;
return (typeof name == ‘string‘ && !(1 in arguments)) ?
(!this.length || this[0].nodeType !== 1 ? undefined :
(!(result = this[0].getAttribute(name)) && name in this[0]) ? this[0][name] : result
) :
this.each(function(idx){
if (this.nodeType !== 1) {
return;
}
if (isObject(name)) {
for (key in name) {
setAttribute(this, key, name[key]);
}
} else {
setAttribute(this, name, funcArg(this, value, idx, this.getAttribute(name)));
}
});
},
// css属性设置
css: function(property, value) {
if (arguments.length < 2) {
var element = this[0];
var computedStyle = getComputedStyle(element, ‘‘);
if (!element) {
return;
}
if (typeof property == ‘string‘) {
return element.style[camelize(property)] || computedStyle.getPropertyValue(property);
} else if (isArray(property)) {
var props = {};
$.each(isArray(property) ? property : [property], function(_, prop) {
props[prop] = (element.style[camelize(prop)] || computedStyle.getPropertyValue(prop));
});
return props;
}
}
var css = ‘‘;
if (type(property) == ‘string‘) {
if (!value && value !== 0) {
this.each(function() {
this.style.removeProperty(dasherize(property));
});
} else {
css = dasherize(property) + ":" + maybeAddPx(property, value);
}
} else {
for (var key in property) {
if (!property[key] && property[key] !== 0) {
this.each(function() {
this.style.removeProperty(dasherize(key));
});
} else {
css += dasherize(key) + ‘:‘ + maybeAddPx(key, property[key]) + ";";
}
}
}
return this.each(function() {
this.style.cssText += ‘;‘ + css;
});
}
};
// 继承
zepto.Z.prototype = $.fn;
$.zepto = zepto;
return $;
})();
// 全局变量接口
window.Zepto = Zepto;
window.$ === undefined && (window.$ = Zepto);
Zepto源代码分析之二~三个API