Welcome to [Hexo]

JS封装方法总结

求滚动条滚动距离

function getScrollOffset() {
    if (window.pageXOffset) {
        return {
            x: window.pageXOffset,
            y: window.pageYOffset
        }
    } else {
        return {
            x: document.body.scrollLeft + document.documentElement.scrollLeft,
            y: document.body.scrollTop + document.documentElement.scrollTop
        }
    }
}

返回浏览器视口尺寸

function getViewportOffset() {
    if (window.innerWidth) {
        return {
            w: window.innerWidth,
            h: window.innerHeight
        }
    } else {
        if (document.compatMode === "BackCompat") {
            return {
                w: document.body.clientWidth,
                h: document.body.clientHeight
            }
        } else {
            return {
                w: document.documentElement.clientWidth,
                h: document.documentElement.clientHeight
            }
        }
    }
}

获取元素样式(兼容)

function getStyle(elem, prop) {
    if (window.getComputedStyle) {
        return window.getComputedStyle(elem, null)[prop];
    } else {
        return elem.currentStyle[prop];
    }
}

给一个dom对象添加该事件类型的函数（兼容）

function addEvent(elem, type, handle) {
    if (elem.addEventListener) {
        elem.addEventListener(type, handle, false);
    } else if (elem.attachEvent) {
        elem.attachEvent('on' + type, function () {
            handle.call(elem);
        })
    } else {
        elem['on' + type] = handle;
    }
}

删除事件

function removeEvent(elem, type, handle) {
    if (typeof elem.removeEventListener !== 'undefined') {
        elem.removeEventListener(type, handle, false);
    } else if (typeof elem.detachEvent !== 'undefined') {
        elem.detachEvent('on' + type);
    }
}

取消冒泡（兼容）

function stopBubble(event) {
    if (event.stopPropagation) {
        event.stopPropagation();
    } else {
        event.cancelBubble = true;
    }
}

阻止默认事件函数

function cancelHandler(event) {
    if (event.preventDefault) {
        event.preventDefault();
    } else {
        event.returnValue = false;
    }
}

拖拽事件

function drag(elem) {
    var disX,
        disY;
    addEvent(elem, 'mousedown', function (e) {
        var event = e || window.event;
        disX = event.clientX - parseInt(getStyle(elem, 'left'));
        disY = event.clientY - parseInt(getStyle(elem, 'top'));
        addEvent(document, 'mousemove', mouseMove);
        addEvent(document, 'mouseup', mouseUp);
        stopBubble(event);
        cancelHandler(event);
    });
    function mouseMove(e) {
        var event = e || window.event;
        elem.style.left = event.clientX - disX + "px";
        elem.style.top = event.clientY - disY + "px";
    }
    function mouseUp(e) {
        var event = e || window.event;
        removeEvent(document, 'mousemove', mouseMove);
        removeEvent(document, 'mouseup', mouseUp);
    }
}

异步加载（兼容）

function loadScript(url, callback) {
    var script = document.createElement('script');
    script.type = "text/javascript";
    if (script.readyState) {
        script.onreadstatechange = function () {//IE
            if (script.readyState == "complete" || script.readyStatereadyState == "loaded") {
                callback();
            }
        }
    } else {
        script.onload = function () {
            callback();
        }
    }
    script.src = url;
    document.head.appendChild(script);
}
loadScript('/*路径*/', function () {
    test();
})

获取指定标签对象

/**
 * 获取指定标签对象
 * @param id 标签的id属性值
 * @returns {Element}根据id属性值返回指定标签对象
 */
function my$(id) {
    return document.getElementById(id);
}

设置任意的标签中间的任意文本内容

function setInnerText(element, text) {
    //判断浏览器是否支持这个属性
    if (typeof element.textContent == "undefined") {//不支持
        element.innerText = text;
    } else {//支持这个属性
        element.textContent = text;
    }
}
my$("btn").onclick = function () {
    console.log(getInnerText(my$("dv")));
};

获取任意标签中间的文本内容

function getInnerText(element) {
    if (typeof element.textContent == "undefined") {
        return element.innerText;
    } else {
        return element.textContent;
    }
}
my$("btn").onclick = function () {
    setInnerText(my$("dv"), "哈哈,我又变帅了");
};

获取任意一个父级元素的第一个子级元素

function getFirstElementChild(element) {
    if (element.firstElementChild) {//true--->支持
        return element.firstElementChild;
    } else {
        var node = element.firstChild;//第一个节点
        while (node && node.nodeType != 1) {
            node = node.nextSibling;
        }
        return node;
    }
}
console.log(getFirstElementChild(my$("uu")).innerText);

获取任意一个父级元素的最后一个子级元素

function getLastElementChild(element) {
    if (element.lastElementChild) {//true--->支持
        return element.lastElementChild;
    } else {
        var node = element.lastChild;//第一个节点
        while (node && node.nodeType != 1) {
            node = node.previousSibling;
        }
        return node;
    }
}
console.log(getLastElementChild(my$("uu")).innerText);

获取某个元素的前一个兄弟元素

/**
 * 获取某个元素的前一个兄弟元素
 * @param element 某个元素
 * @returns {*} 前一个兄弟元素
 */
function getPreviousElement(element) {
    if (element.previousElementSibling) {
        return element.previousElementSibling
    } else {
        var node = element.previousSibling;
        while (node && node.nodeType != 1) {
            node = node.previousSibling;
        }
        return node;
    }
}

获取某个元素的后一个兄弟元素

/**
 * 获取某个元素的后一个兄弟元素
 * @param element 某个元素
 * @returns {*} 后一个兄弟元素
 */
function getNextElement(element) {
    if (element.nextElementSibling) {
        return element.nextElementSibling
    } else {
        var node = element.nextSibling;
        while (node && node.nodeType != 1) {
            node = node.nextSibling;
        }
        return node;
    }
}

获取某个元素的所有兄弟元素

/**
 * 获取某个元素的所有兄弟元素
 * @param element 某个元素
 * @returns {Array} 兄弟元素
 */
function getSiblings(element) {
    if (!element) return;
    var elements = [];
    var ele = element.previousSibling;
    while (ele) {
        if (ele.nodeType === 1) {
            elements.push(ele);
        }
        ele = ele.previousSibling;
    }
    ele = element.nextSibling;
    while (ele) {
        if (ele.nodeType === 1) {
            elements.push(ele);

        }
        ele = ele.nextSibling;
    }
    return elements;
}

为任意元素.绑定任意的事件, 任意的元素,事件的类型,事件处理函数

function addEventListener(element, type, fn) {
    //判断浏览器是否支持这个方法
    if (element.addEventListener) {
        element.addEventListener(type, fn, false);
    } else if (element.attachEvent) {
        element.attachEvent("on" + type, fn);
    } else {
        element["on" + type] = fn;
    }
}

为任意的一个元素,解绑对应的事件

function removeEventListener(element, type, fnName) {
    if (element.removeEventListener) {
        element.removeEventListener(type, fnName, false);
    } else if (element.detachEvent) {
        element.detachEvent("on" + type, fnName);
    } else {
        element["on" + type] = null;
    }
}

格式化日期

/**
 * 格式化日期
 * @param dt 日期对象
 * @returns {string} 返回值是格式化的字符串日期
 */
function getDates(dt) {
    var str = "";//存储时间的字符串
    //获取年
    var year = dt.getFullYear();
    //获取月
    var month = dt.getMonth() + 1;
    //获取日
    var day = dt.getDate();
    //获取小时
    var hour = dt.getHours();
    //获取分钟
    var min = dt.getMinutes();
    //获取秒
    var sec = dt.getSeconds();
    month = month < 10 ? "0" + month : month;
    day = day < 10 ? "0" + day : day;
    hour = hour < 10 ? "0" + hour : hour;
    min = min < 10 ? "0" + min : min;
    sec = sec < 10 ? "0" + sec : sec;
    str = year + "年" + month + "月" + day + "日 " + hour + ":" + min + ":" + sec;
    return str;
}

返回当前浏览器是什么类型的浏览器

function userBrowser() {
    var browserName = navigator.userAgent.toLowerCase();
    if (/msie/i.test(browserName) && !/opera/.test(browserName)) {
        console.log("IE");
    } else if (/firefox/i.test(browserName)) {
        console.log("Firefox");
    } else if (/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName)) {
        console.log("Chrome");
    } else if (/opera/i.test(browserName)) {
        console.log("Opera");
    } else if (/webkit/i.test(browserName) && !(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName))) {
        console.log("Safari");
    } else {
        console.log("不知道什么鬼!");
    }
}

动画函数—任意一个元素移动到指定的目标位置

function animate(element, target) {
    //先清理定时器
    clearInterval(element.timeId);
    //一会要清理定时器(只产生一个定时器)
    element.timeId = setInterval(function () {
        //获取div的当前的位置
        var current = element.offsetLeft;//数字类型,没有px
        //div每次移动多少像素---步数
        var step = 10;
        step = current < target ? step : -step;
        //每次移动后的距离
        current += step;
        //判断当前移动后的位置是否到达目标位置
        if (Math.abs(target - current) > Math.abs(step)) {
            element.style.left = current + "px";
        } else {
            //清理定时器
            clearInterval(element.timeId);
            element.style.left = target + "px";
        }
    }, 20);
}
my$("btn2").onclick = function () {
    animate(my$("dv"), 800);
};

变速动画-任意一个元素移动到指定的目标位置

function animateChange(element, target) {
    //清理定时器
    clearInterval(element.timeId);
    element.timeId = setInterval(function () {
      //获取元素的当前位置
      var current = element.offsetLeft;
      //移动的步数
      var step = (target-current)/10;
      step = step>0?Math.ceil(step):Math.floor(step);
      current += step;
      element.style.left = current + "px";
      if(current==target) {
        //清理定时器
        clearInterval(element.timeId);
      }
      //测试代码:
      console.log("目标位置:"+target+",当前位置:"+current+",每次移动步数:"+step);
    }, 20);
  }
  my$("btn2").onclick = function () {
    animateChange(my$("dv"), 800);
};

foreach的兼容代码

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
    };
}