常用的前端 JavaScript 方法封裝（上）
1、輸入一個(gè)值，返回其數(shù)據(jù)類型
function?type(para)?{
????return?Object.prototype.toString.call(para)
}
2、數(shù)組去重
function?unique1(arr)?{
????return?[...new?Set(arr)]
}
function?unique2(arr)?{
????var?obj?=?{};
????return?arr.filter(ele?=>?{
????????if?(!obj[ele])?{
????????????obj[ele]?=?true;
????????????return?true;
????????}
????})
}
function?unique3(arr)?{
????var?result?=?[];
????arr.forEach(ele?=>?{
????????if?(result.indexOf(ele)?==?-1)?{
????????????result.push(ele)
????????}
????})
????return?result;
}
3、字符串去重
String.prototype.unique?=?function?()?{
????var?obj?=?{},
????????str?=?'',
????????len?=?this.length;
????for?(var?i?=?0;?i?????????if?(!obj[this[i]])?{
????????????str?+=?this[i];
????????????obj[this[i]]?=?true;
????????}
????}
????return?str;
}
######?//去除連續(xù)的字符串?
function?uniq(str)?{
????return?str.replace(/(\w)\1+/g,?'$1')
}
4、深拷貝 淺拷貝
//深克?。ㄉ羁寺〔豢紤]函數(shù)）
function?deepClone(obj,?result)?{
????var?result?=?result?||?{};
????for?(var?prop?in?obj)?{
????????if?(obj.hasOwnProperty(prop))?{
????????????if?(typeof?obj[prop]?==?'object'?&&?obj[prop]?!==?null)?{
????????????????//?引用值(obj/array)且不為null
????????????????if?(Object.prototype.toString.call(obj[prop])?==?'[object?Object]')?{
????????????????????//?對(duì)象
????????????????????result[prop]?=?{};
????????????????}?else?{
????????????????????//?數(shù)組
????????????????????result[prop]?=?[];
????????????????}
????????????????deepClone(obj[prop],?result[prop])
????}?else?{
????????//?原始值或func
????????result[prop]?=?obj[prop]
????}
??}
}
return?result;
}
//?深淺克隆是針對(duì)引用值
function?deepClone(target)?{
????if?(typeof?(target)?!==?'object')?{
????????return?target;
????}
????var?result;
????if?(Object.prototype.toString.call(target)?==?'[object?Array]')?{
????????//?數(shù)組
????????result?=?[]
????}?else?{
????????//?對(duì)象
????????result?=?{};
????}
????for?(var?prop?in?target)?{
????????if?(target.hasOwnProperty(prop))?{
????????????result[prop]?=?deepClone(target[prop])
????????}
????}
????return?result;
}
//?無(wú)法復(fù)制函數(shù)
var?o1?=?jsON.parse(jsON.stringify(obj1));
5、reverse底層原理和擴(kuò)展
//?改變?cè)瓟?shù)組
Array.prototype.myReverse?=?function?()?{
????var?len?=?this.length;
????for?(var?i?=?0;?i?????????var?temp?=?this[i];
????????this[i]?=?this[len?-?1?-?i];
????????this[len?-?1?-?i]?=?temp;
????}
????return?this;
}
6、圣杯模式的繼承
function?inherit(Target,?Origin)?{
????function?F()?{};
????F.prototype?=?Origin.prototype;
????Target.prototype?=?new?F();
????Target.prototype.constructor?=?Target;
????//?最終的原型指向
????Target.prop.uber?=?Origin.prototype;
}
7、找出字符串中第一次只出現(xiàn)一次的字母
String.prototype.firstAppear?=?function?()?{
????var?obj?=?{},
????????len?=?this.length;
????for?(var?i?=?0;?i?????????if?(obj[this[i]])?{
????????????obj[this[i]]++;
????????}?else?{
????????????obj[this[i]]?=?1;
????????}
????}
????for?(var?prop?in?obj)?{
???????if?(obj[prop]?==?1)?{
?????????return?prop;
???????}
????}
}
8、找元素的第n級(jí)父元素
function?parents(ele,?n)?{
????while?(ele?&&?n)?{
????????ele?=?ele.parentElement???ele.parentElement?:?ele.parentNode;
????????n--;
????}
????return?ele;
}
9、?返回元素的第n個(gè)兄弟節(jié)點(diǎn)
function?retSibling(e,?n)?{
????while?(e?&&?n)?{
????????if?(n?>?0)?{
????????????if?(e.nextElementSibling)?{
????????????????e?=?e.nextElementSibling;
????????????}?else?{
????????????????for?(e?=?e.nextSibling;?e?&&?e.nodeType?!==?1;?e?=?e.nextSibling);
????????????}
????????????n--;
????????}?else?{
????????????if?(e.previousElementSibling)?{
????????????????e?=?e.previousElementSibling;
????????????}?else?{
????????????????for?(e?=?e.previousElementSibling;?e?&&?e.nodeType?!==?1;?e?=?e.previousElementSibling);
????????????}
????????????n++;
????????}
????}
????return?e;
}
10、封裝mychildren，解決瀏覽器的兼容問(wèn)題
function?myChildren(e)?{
????var?children?=?e.childNodes,
????????arr?=?[],
????????len?=?children.length;
????for?(var?i?=?0;?i?????????if?(children[i].nodeType?===?1)?{
????????????arr.push(children[i])
????????}
????}
????return?arr;
}
11、判斷元素有沒有子元素
function?hasChildren(e)?{
????var?children?=?e.childNodes,
????????len?=?children.length;
????for?(var?i?=?0;?i?????????if?(children[i].nodeType?===?1)?{
????????????return?true;
????????}
????}
????return?false;
}
12、我一個(gè)元素插入到另一個(gè)元素的后面
Element.prototype.insertAfter?=?function?(target,?elen)?{
????var?nextElen?=?elen.nextElenmentSibling;
????if?(nextElen?==?null)?{
????????this.appendChild(target);
????}?else?{
????????this.insertBefore(target,?nextElen);
????}
}
13、返回當(dāng)前的時(shí)間（年月日時(shí)分秒）
function?getDateTime()?{
????var?date?=?new?Date(),
????????year?=?date.getFullYear(),
????????month?=?date.getMonth()?+?1,
????????day?=?date.getDate(),
????????hour?=?date.getHours()?+?1,
????????minute?=?date.getMinutes(),
????????second?=?date.getSeconds();
????????month?=?checkTime(month);
????????day?=?checkTime(day);
????????hour?=?checkTime(hour);
????????minute?=?checkTime(minute);
????????second?=?checkTime(second);
?????function?checkTime(i)?{
????????if?(i?????????????????i?=?"0"?+?i;
???????}
??????return?i;
????}
????return?""?+?year?+?"年"?+?month?+?"月"?+?day?+?"日"?+?hour?+?"時(shí)"?+?minute?+?"分"?+?second?+?"秒"
}
14、獲得滾動(dòng)條的滾動(dòng)距離
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
????????}
????}
}
15、獲得視口的尺寸
function?getViewportOffset()?{
????if?(window.innerWidth)?{
????????return?{
????????????w:?window.innerWidth,
????????????h:?window.innerHeight
????????}
????}?else?{
????????//?ie8及其以下
????????if?(document.compatMode?===?"BackCompat")?{
????????????//?怪異模式
????????????return?{
????????????????w:?document.body.clientWidth,
????????????????h:?document.body.clientHeight
????????????}
????????}?else?{
????????????//?標(biāo)準(zhǔn)模式
????????????return?{
????????????????w:?document.documentElement.clientWidth,
????????????????h:?document.documentElement.clientHeight
????????????}
????????}
????}
}
16、獲取任一元素的任意屬性
function?getStyle(elem,?prop)?{
????return?window.getComputedStyle???window.getComputedStyle(elem,?null)[prop]?:?elem.currentStyle[prop]
}
17、綁定事件的兼容代碼
function?addEvent(elem,?type,?handle)?{
????if?(elem.addEventListener)?{?//非ie和非ie9
????????elem.addEventListener(type,?handle,?false);
????}?else?if?(elem.attachEvent)?{?//ie6到ie8
????????elem.attachEvent('on'?+?type,?function?()?{
????????????handle.call(elem);
????????})
????}?else?{
????????elem['on'?+?type]?=?handle;
????}
}
18、解綁事件
function?removeEvent(elem,?type,?handle)?{
????if?(elem.removeEventListener)?{?//非ie和非ie9
????????elem.removeEventListener(type,?handle,?false);
????}?else?if?(elem.detachEvent)?{?//ie6到ie8
????????elem.detachEvent('on'?+?type,?handle);
????}?else?{
????????elem['on'?+?type]?=?null;
????}
}
19、取消冒泡的兼容代碼
function?stopBubble(e)?{
????if?(e?&&?e.stopPropagation)?{
????????e.stopPropagation();
????}?else?{
????????window.event.cancelBubble?=?true;
????}
}
20、檢驗(yàn)字符串是否是回文
function?isPalina(str)?{
????if?(Object.prototype.toString.call(str)?!==?'[object?String]')?{
????????return?false;
????}
????var?len?=?str.length;
????for?(var?i?=?0;?i?????????if?(str[i]?!=?str[len?-?1?-?i])?{
????????????return?false;
????????}
????}
????return?true;
}
21、檢驗(yàn)字符串是否是回文
function?isPalindrome(str)?{
????str?=?str.replace(/\W/g,?'').toLowerCase();
????console.log(str)
????return?(str?==?str.split('').reverse().join(''))
}
22、兼容getElementsByClassName方法
Element.prototype.getElementsByClassName?=?Document.prototype.getElementsByClassName?=?function?(_className)?{
????var?allDomArray?=?document.getElementsByTagName('*');
????var?lastDomArray?=?[];
????function?trimSpace(strClass)?{
????????var?reg?=?/\s+/g;
????????return?strClass.replace(reg,?'?').trim()
????}
????for?(var?i?=?0;?i?????????var?classArray?=?trimSpace(allDomArray[i].className).split('?');
????????for?(var?j?=?0;?j?????????????if?(classArray[j]?==?_className)?{
????????????????lastDomArray.push(allDomArray[i]);
????????????????break;
????????????}
????????}
????}
????return?lastDomArray;
}
23、運(yùn)動(dòng)函數(shù)
function?animate(obj,?json,?callback)?{
????clearInterval(obj.timer);
????var?speed,
????????current;
????obj.timer?=?setInterval(function?()?{
????????var?lock?=?true;
????????for?(var?prop?in?json)?{
????????????if?(prop?==?'opacity')?{
????????????????current?=?parseFloat(window.getComputedStyle(obj,?null)[prop])?*?100;
????????????}?else?{
????????????????current?=?parseInt(window.getComputedStyle(obj,?null)[prop]);
????????????}
????????????speed?=?(json[prop]?-?current)?/?7;
????????????speed?=?speed?>?0???Math.ceil(speed)?:?Math.floor(speed);
????????????if?(prop?==?'opacity')?{
????????????????obj.style[prop]?=?(current?+?speed)?/?100;
????????????}?else?{
????????????????obj.style[prop]?=?current?+?speed?+?'px';
????????????}
????????????if?(current?!=?json[prop])?{
????????????????lock?=?false;
????????????}
????????}
????????if?(lock)?{
????????????clearInterval(obj.timer);
????????????typeof?callback?==?'function'???callback()?:?'';
????????}
????},?30)
}
24、彈性運(yùn)動(dòng)
function?ElasticMovement(obj,?target)?{
????clearInterval(obj.timer);
????var?iSpeed?=?40,
????????a,?u?=?0.8;
????obj.timer?=?setInterval(function?()?{
????????a?=?(target?-?obj.offsetLeft)?/?8;
????????iSpeed?=?iSpeed?+?a;
????????iSpeed?=?iSpeed?*?u;
????????if?(Math.abs(iSpeed)?<=?1?&&?Math.abs(a)?<=?1)?{
????????????console.log('over')
????????????clearInterval(obj.timer);
????????????obj.style.left?=?target?+?'px';
????????}?else?{
????????????obj.style.left?=?obj.offsetLeft?+?iSpeed?+?'px';
????????}
????},?30);
}
25、封裝自己的forEach方法
Array.prototype.myForEach?=?function?(func,?obj)?{
????var?len?=?this.length;
????var?_this?=?arguments[1]???arguments[1]?:?window;
????//?var?_this=arguments[1]||window;
????for?(var?i?=?0;?i?????????func.call(_this,?this[i],?i,?this)
????}
}
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