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webinf下怎麼引入js 2023-08-31 21:54:13
堡壘機怎麼打開web 2023-08-31 21:54:11

前端引用

發布時間: 2022-06-21 09:12:12

A. WEB前端學習五 js什麼是引用類型

三大引用類型,對象,數組,函數。引用類型和基本類型主要區別是引用類型存的是地址,但其實在JS中 萬事萬物皆對象,本質上來講大家都可以算對象

B. 前端JS模板可定義在其他文件並引用嗎

可以的,引用的文件有用就行

C. web前端 響應式開發關於引用js文件的問題

可以考慮動態載入,在JS中判斷,再用 document.write("<script...
來動態載入JS文件,很多JS框架使用動態載入.

D. rem的前端頁面引用插件是px怎麼辦

多年的前端開發實踐中經歷了從最初的PC固定布局、手機端固定布局(兩端留白)到響應式設計(媒體查詢、百分比布局等),直到最終選擇rem+Javascript的模式,但是在項目開發中需要將大量的樣式由px轉換為rem,單位之間的換算雖然不復雜,但是工作量卻很大。那麼能不能有一種自動化的解決方案呢?通過搜索,找到了一種方案。讀者可以直接在網路搜索引擎中搜索「用grunt寫了一個px和rem互轉的工具」,點擊圖中用邊框標示的部分,進入「用grunt寫了一個px和rem互轉的工具」頁面,在該文章的末尾還提供了一個在線轉換工具,如下圖所示,可以很方便地將px轉換為rem,批量操作,幾秒就能完成。筆者將實際項目中的CSS代碼拷貝進入轉換,有幾個參數要選擇,進行轉換效果如這里的參數選擇和你在項目中的設計圖尺寸和根元素字體大小相關,至於border的處理是因為在安卓下使用rem單位的支持性特別差,你可能寫2rem或者3rem都沒用默認會變成1px,所以在使用border屬性時很多時候不建議處理border。Javascript控制根元素大小的代碼讀者可以將代碼放在公共的Js文件中,確保每個HTML文件都引用到。在線工具中還提供了自動生成媒體查詢的功能,這在響應式設計中可以少些許多CSS代碼,讓前端開發事半功倍。這里不做介紹,讀者根據實際情況決定是否使用該功能。其實,讀者也可以自己寫一個javascript函數實現上述功能,不過,重復發明輪子也沒有什麼意義,除了上面的工具之外(javascript實現),還有Sass的方案。網路有相關的文章,讀者可以去研讀,不過,還是在線工具為最佳,當然也可以將該工具下載下來使用。

E. web前端怎麼引用jquery省市級聯插件


1.[代碼]新增選擇城市


$(function(){
$("#province").cityCasCade("#city").cityCasCade('select','河南省');
//or
$("#province").cityCasCade("#city").cityCasCade('select','河南省','開封市');
}

/**
*javadiqye
*城市數據時從網上Copy的
*級聯功能也是參考網上已做好的思路
*封裝成插件為了以後使用方便
*add增加選中城市方法select
*/
(function($){
$.fn.cityCasCade=function(operation,province,city){
varselectCity=null,params=null,overparams=null;
if(typeofoperation=="string"){
if(operation=="select"){
if(province){
$(this).find("option").each(function(){
if($(this).val()==province){
this.selected=true;
$(this).change();
if(city){
$($.fn.cityCascadeParam.selectCity).find("option").each(function(){
if($(this).val()==city){
this.selected=true;
$(this).change();
}
});
}
}
});
}
return$(this);
}
selectCity=operation;
}
else{
if(operation.selector)selectCity=operation.selector;
if(operation.overide&&operation.data)overparams=operation.data;
elseparams=operation.data;
}
$.fn.cityCascadeParam={};
$.fn.cityCascadeParam.data=_provinces_;
$.fn.cityCascadeParam.selectCity=null;
if(selectCity)$.fn.cityCascadeParam.selectCity=selectCity;
elsethrow"城市選擇器不能為空";
$.fn.cityCascadeParam.cityValue=$($.fn.cityCascadeParam.selectCity+":first").val();
$.fn.cityCascadeParam.cityText=$($.fn.cityCascadeParam.selectCity+":first").text();
if(overparams)$.fn.cityCascadeParam.data=overparams;
else$.extend($.fn.cityCascadeParam.data,params);
$.fn.cityCascadeParam.loadProvince=function(self){
for(varpin$.fn.cityCascadeParam.data){
varopt=document.createElement("option");
opt.innerHTML=p;
opt.value=p;
self.appendChild(opt);
}
}
$.fn.cityCascadeParam.loadCity=function(parent){
varself=$($.fn.cityCascadeParam.selectCity).get(0);
if(!self)throw"未找到城市下拉框城市選擇器>>"+$.fn.cityCascadeParam.selectCity;
varselectProvince=$(parent).val();
if(selectProvincein$.fn.cityCascadeParam.data){
varcitys=$.fn.cityCascadeParam.data[selectProvince];
self.innerHTML="";
for(varindex=0;index<citys.length;index++){
opt=document.createElement("option");
opt.innerHTML=citys[index];
opt.value=citys[index];
self.appendChild(opt);
}
}else{
self.innerHTML="";
opt=document.createElement("option");
opt.innerHTML=$.fn.cityCascadeParam.cityText;
opt.value=$.fn.cityCascadeParam.cityValue;
self.appendChild(opt);
}
}
this.each(function(){
$.fn.cityCascadeParam.loadProvince(this);
$(this).change(function(){
$.fn.cityCascadeParam.loadCity(this);
});
});

return$(this);
}
})($);
var_provinces_={四川省:["成都市","自貢市","攀枝花市","瀘州市","德陽市","綿陽市","廣元市","遂寧市","內江市","樂山市","南充市","眉山市","宜賓市","廣安市","達州市","雅安市","巴中市","資陽市","阿壩藏族羌族自治州","甘孜藏族自治州","涼山彝族自治州"],山西省:["太原市","大同市","陽泉市","長治市","晉城市","朔州市","晉中市","運城市","忻州市","臨汾市","呂梁市"],內蒙古:["呼和浩特市","包頭市","烏海市","赤峰市","通遼市","鄂爾多斯市","呼倫貝爾市","巴彥淖爾市","烏蘭察布市","興安盟","錫林郭勒盟","阿拉善盟"],遼寧省:["沈陽市","大連市","鞍山市","撫順市","本溪市","丹東市","錦州市","營口市","阜新市","遼陽市","盤錦市","鐵嶺市","朝陽市","葫蘆島市"],吉林省:["長春市","吉林市","四平市","遼源市","通化市","白山市","松原市","白城市","延邊朝鮮族自治州"],黑龍江省:["哈爾濱市","齊齊哈爾市","雞西市","鶴崗市","雙鴨山市","大慶市","伊春市","佳木斯市","七台河市","牡丹江市","黑河市","綏化市","大興安嶺地區"],上海:["上海"],江蘇省:["南京市","無錫市","徐州市","常州市","蘇州市","南通市","連雲港市","淮安市","鹽城市","揚州市","鎮江市","泰州市","宿遷市"],浙江省:["杭州市","寧波市","溫州市","嘉興市","湖州市","紹興市","金華市","衢州市","舟山市","台州市","麗水市"],安徽省:["合肥市","蕪湖市","蚌埠市","淮南市","馬鞍山市","淮北市","銅陵市","安慶市","黃山市","滁州市","阜陽市","宿州市","巢湖市","六安市","亳州市","池州市","宣城市"],福建省:["福州市","廈門市","莆田市","三明市","泉州市","漳州市","南平市","龍岩市","寧德市"],江西省:["南昌市","景德鎮市","萍鄉市","九江市","新余市","鷹潭市","贛州市","吉安市","宜春市","撫州市","上饒市"],山東省:["濟南市","青島市","淄博市","棗庄市","東營市","煙台市","濰坊市","濟寧市","泰安市","威海市","日照市","萊蕪市","臨沂市","德州市","聊城市","濱州市","菏澤市"],河南省:["鄭州市","開封市","洛陽市","平頂山市","安陽市","鶴壁市","新鄉市","焦作市","濮陽市","許昌市","漯河市","三門峽市","南陽市","商丘市","信陽市","周口市","駐馬店市"],湖北省:["武漢市","黃石市","十堰市","宜昌市","襄樊市","鄂州市","荊門市","孝感市","荊州市","黃岡市","咸寧市","隨州市","恩施土家族苗族自治州"],湖南省:["長沙市","株洲市","湘潭市","衡陽市","邵陽市","岳陽市","常德市","張家界市","益陽市","郴州市","永州市","懷化市","婁底市","湘西土家族苗族自治州"],廣東省:["廣州市","韶關市","深圳市","珠海市","汕頭市","佛山市","江門市","湛江市","茂名市","肇慶市","惠州市","梅州市","汕尾市","河源市","陽江市","清遠市","東莞市","中山市","潮州市","揭陽市","雲浮市"],廣西省:["南寧市","柳州市","桂林市","梧州市","北海市","防城港市","欽州市","貴港市","玉林市","百色市","賀州市","河池市","來賓市","崇左市"],海南省:["海口市","三亞市"],重慶市:["重慶"],貴州省:["貴陽市","六盤水市","遵義市","安順市","銅仁地區","黔西南布依族苗族自治州","畢節地區","黔東南苗族侗族自治州","黔南布依族苗族自治州"],雲南省:["昆明市","曲靖市","玉溪市","保山市","昭通市","麗江市","思茅市","臨滄市","楚雄彝族自治州","紅河哈尼族彝族自治州","文山壯族苗族自治州","西雙版納傣族自治州","大理白族自治州","德宏傣族景頗族自治州","怒江傈僳族自治州","迪慶藏族自治州"],西藏自治區:["拉薩市","昌都地區","山南地區","日喀則地區","那曲地區","阿里地區","林芝地區"],陝西省:["西安市","銅川市","寶雞市","咸陽市","渭南市","延安市","漢中市","榆林市","安康市","商洛市"],甘肅省:["蘭州市","嘉峪關市","金昌市","白銀市","天水市","武威市","張掖市","平涼市","酒泉市","慶陽市","定西市","隴南市","臨夏回族自治州","甘南藏族自治州"],青海省:["西寧市","海東地區","海北藏族自治州","黃南藏族自治州","海南藏族自治州","果洛藏族自治州","玉樹藏族自治州","海西蒙古族藏族自治州"],寧夏自治區:["銀川市","石嘴山市","吳忠市","固原市","中衛市"],新疆自治區:["烏魯木齊市","克拉瑪依市","吐魯番地區","哈密地區","昌吉回族自治州","博爾塔拉蒙古自治州","巴音郭楞蒙古自治州","阿克蘇地區","克孜勒蘇柯爾克孜自治州","喀什地區","和田地區","伊犁哈薩克自治州","塔城地區","阿勒泰地區"],台灣省:["台北市"],香港特區:["香港"],澳門特區:["澳門"],河北省:["石家莊","唐山","秦皇島","張家口","承德","廊坊","邯鄲","邢台","保定","滄州","衡水"]};

F. 前端開發,引用別人建的組建,怎麼修改相關內容

主要看你引用的是開發版本還是上線版本。。上線版本一般都是壓縮後的也就是.min.js後綴的。。開發版本源碼看著比較清晰。。你可以找到開發版本修改,上線時候如需要再壓縮

G. 前端開發如何引用插件

一般的插件都是有自己的CSS和JS文件的,你直接把它們載入你的head里,如下:

<script src="你找到的插件提供的JS文件地址">

如果你在用J2EE或者,C#MVC框架開發web應用系統的話,有一個神器推薦給你--「活字格」,絕對好用。另外,就是任何的插件都是有說明文檔的你看他的說明文檔怎麼用。

還有,做為一個開發者,糾正你一個名詞,這個一般叫控制項不叫插件 。

H. 前端Vue+Element 框架怎麼引用Echars創建柱線混合圖,如下圖

npm 安裝 然後在需要用echart的地方引用就行了。跟引用組件的方式一樣
npm install echarts --save

I. 前端引入和引用的區別

href 表示超文本引用(hypertext reference),在 link和a 等元素上使用。src 表示來源地址,在 img、script、iframe 等元素上。
src 的內容,是頁面必不可少的一部分,是引入。href 的內容,是與該頁面有關聯,是引用。區別就是,引入和引用。

J. 前端開發,關於引用第三方開源插件有什麼要求

  1. name決定模塊的名稱,不允許與npm社區中的已發布模塊同名,模塊發布後,其他開發者可以通過該名稱安裝該模塊。

  2. version需遵循語義化版本規范,格式為[MAJOR].[MINOR].[PATCH],分別代表主版本,次版本,補丁版本,可以通過執行npm version命令自動更替版本。

  3. main表示模塊的入口文件,用戶通過require('example')載入該入口文件。