①nextSibling 下一个兄弟节点,可能是非元素节点;会获取到文本节点
②previousSibling 上一个兄弟节点,可能是非元素节点;会获取到文本节点
①previousElementSibling 获取上一个紧邻的兄弟元素,会忽略空白
②nextElementSibling 获取下一个紧邻的兄弟元素,会忽略空白
//兼容浏览器 // 获取下一个紧邻的兄弟元素 function getNextElement(element) { // 能力检测 if(element.nextElementSibling) { return element.nextElementSibling; } else { var node = element.nextSibling; while(node && node.nodeType !== 1) { node = node.nextibling; } return node; } }
/** * 返回上一个元素 * @param element * @returns {*} */ function getPreviousElement(element) { if(element.previousElementSibling) { return element.previousElementSibling; }else { var el = element.previousSibling; while(el && el.nodeType !== 1) { el = el.previousSibling; } return el; } }
/** * 返回第一个元素firstElementChild的浏览器兼容 * @param parent * @returns {*} */ function getFirstElement(parent) { if(parent.firstElementChild) { return parent.firstElementChild; }else { var el = parent.firstChild; while(el && el.nodeType !== 1) { el = el.nextSibling; } return el; } }
/** * 返回最后一个元素 * @param parent * @returns {*} */ function getLastElement(parent) { if(parent.lastElementChild) { return parent.lastElementChild; }else { var el = parent.lastChild; while(el && el.nodeType !== 1) { el = el.previousSibling; } return el; } }
/** *获取当前元素的所有兄弟元素 * @param element * @returns {Array} */ function sibling(element) { if(!element) return ; var elements = [ ]; var el = element.previousSibling; while(el) { if(el.nodeType === 1) { elements.push(el); } el = el.previousSibling; } el = element.previousSibling; while(el ) { if(el.nodeType === 1) { elements.push(el); } el = el.nextSibling; } return elements; }
3、array.filter();
// 使用指定的函数测试所有元素,并创建一个包含所有通过测试的元素的新数组 // 兼容旧环境 if (!Array.prototype.filter) { Array.prototype.filter = function(fun /*, thisArg */) { "use strict"; if (this === void 0 || this === null) throw new TypeError(); var t = Object(this); var len = t.length >>> 0; if (typeof fun !== "function") throw new TypeError(); var res = []; var thisArg = arguments.length >= 2 ? arguments[1] : void 0; for (var i = 0; i < len; i++) { if (i in t) { var val = t[i]; // NOTE: Technically this should Object.defineProperty at // the next index, as push can be affected by // properties on Object.prototype and Array.prototype. // But that method's new, and collisions should be // rare, so use the more-compatible alternative. if (fun.call(thisArg, val, i, t)) res.push(val); } } return res; }; }
4、array.forEach();
// 遍历数组 //兼容旧环境 // Production steps of ECMA-262, Edition 5, 15.4.4.18 // Reference: http://es5.github.io/#x15.4.4.18 if (!Array.prototype.forEach) { Array.prototype.forEach = function(callback, thisArg) { var T, k; if (this == null) { throw new TypeError(' this is null or not defined'); } // 1. Let O be the result of calling toObject() passing the // |this| value as the argument. var O = Object(this); // 2. Let lenValue be the result of calling the Get() internal // method of O with the argument "length". // 3. Let len be toUint32(lenValue). var len = O.length >>> 0; // 4. If isCallable(callback) is false, throw a TypeError exception. // See: http://es5.github.com/#x9.11 if (typeof callback !== "function") { throw new TypeError(callback + ' is not a function'); } // 5. If thisArg was supplied, let T be thisArg; else let // T be undefined. if (arguments.length > 1) { T = thisArg; } // 6. Let k be 0 k = 0; // 7. Repeat, while k < len while (k < len) { var kValue; // a. Let Pk be ToString(k). // This is implicit for LHS operands of the in operator // b. Let kPresent be the result of calling the HasProperty // internal method of O with argument Pk. // This step can be combined with c // c. If kPresent is true, then if (k in O) { // i. Let kValue be the result of calling the Get internal // method of O with argument Pk. kValue = O[k]; // ii. Call the Call internal method of callback with T as // the this value and argument list containing kValue, k, and O. callback.call(T, kValue, k, O); } // d. Increase k by 1. k++; } // 8. return undefined }; }
5、注册事件
.addEventListener = function (type,listener,useCapture ) { };
//第一个参数 事件名称 //第二个参数 事件处理函数(监听者) //第三个参数 true捕获 false冒泡 //IE9以后才支持 // 兼容旧环境 var EventTools = { addEventListener: function (element, eventName, listener) { //能力检测 if(element.addEventListener) { element.addEventListener(eventName, listener,false); }else if(element.attachEvent) { element.attachEvent("on" + eventName, listener); }else{ element["on" + eventName] = listener; } }, // 想要移除事件,不能使用匿名函数 removeEventListener: function (element, eventName, listener) { if(element.removeEventListener) { element.removeEventListener(eventName,listener,false); }else if(element.detachEvent) { //IE8以前注册.attachEvent和移除事件.detachEvent element.detachEvent("on"+eventName,listener); }else{ element["on" + eventName] = null; } } };
6、事件对象
1)事件参数e,就是事件对象,标准的获取方式
btn.onclick = function(e) { } 2)e.eventPhase事件阶段,IE8以前不支持 3)e.target始终是触发事件的对象(点击的按钮) i)IE8以前 srcElement ii)浏览器兼容
var target = e.target || window.event.srcElement;1 // 获取事件对象 兼容浏览器 getEvent: function(e) { return e || window.event; // e事件对象 标准的获取方式; window.event IE8以前获取事件对象的方式 } // 兼容target getTarget: function(e) { return e.target || e.srcElement; }
7、获取鼠标在页面上的位置
①在可视区域中的位置: e.clientX e.clientY ②在文档中的位置: i) e.pageX e.pageY ii)浏览器兼容
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; var pageY = e.clientY + scrollTop;
8、获取页面滚动的距离
// 兼容浏览器 var scrollTop = document.documentElement.scrollTop || document.body.scrolltop;
9、取消文本的选择
// 兼容浏览器 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();