1.題目使用jQuery技術(shù)實現(xiàn)企業(yè)信息展示系統(tǒng)的相關(guān)功能。2.目的（1）掌握jQuery的基本知識。（2）掌握jQuery的應(yīng)用方法。（3）進一步理解Ajax程序的設(shè)計方法。（4）會利用所學(xué)知識設(shè)計簡單的應(yīng)用程序。3.內(nèi)容用jQuery技術(shù)實現(xiàn)產(chǎn)品的查詢、添加、修改與刪除，用戶的登錄、注冊、查詢和刪除。4.要求（1）從下載jQuery庫。（2）將在客戶端網(wǎng)頁中使用的MyTools中的函數(shù)轉(zhuǎn)換為jQuery函數(shù)。（3）進一步完善功能，優(yōu)化界面。代碼示例：classJq{constructor(arg,root){//記錄上次操作的節(jié)點；if(typeofroot=='undefined'){this.prevObject=newJq(document,null);}if(root){this.prevObject=root;}if(typeofarg=="string"){//字符串leteles=document.querySelectorAll(arg);this.addEvent(eles);}elseif(typeofarg=="function"){window.addEventListener("DOMContentLoaded",arg);}else{//原生節(jié)點；if(typeofarg.length=="undefined"){this[0]=arg;this.length=1;}else{this.addEvent(arg);}}}addEvent(eles){eles.forEach((el,index)=>{this[index]=el;})this.length=eles.length;}eq(index){returnnewJq(this[index],this);}end(){returnthis.prevObject;}click(fn){for(leti=0;i<this.length;i++){this[i].addEventListener("click",fn);}}on(eventName,fn){letreg=/\s+/g;eventName=eventName.replace(reg,"");//console.log(eventName);leteventArr=eventName.split("");for(leti=0;i<eventArr.length;i++){for(letj=0;j<this.length;j++){this[j].addEventListener(eventArr[i],fn);}}}css(...arg){if(arg.length>1){if(arg[0]in$.cssHooks){letitem=arg[0];for(leti=0;i<this.length;i++){$.cssHooks[item].set(this[i],arg[1]);}}else{//2個參數(shù)//設(shè)置樣式for(leti=0;i<this.length;i++){this.setStyle(this[i],arg[0],arg[1]);}}}else{//1個參數(shù)：--》字符串、對象；[obj]if(typeofarg[0]=='string'){if(arg[0]=="wh"&&arg[0]in$.cssHooks){return$.cssHooks[arg[0]].get(this[0]);}else{//字符串：獲取樣式returnthis.getStyle(this[0],arg[0]);}}else{//對象；設(shè)置樣式for(leti=0;i<this.length;i++){for(letjinarg[0]){this.setStyle(this[i],j,arg[0][j]);}}}}}setStyle(ele,styleName,styleValue){if(typeofstyleValue=="number"&&!(styleNamein$.cssNumber)){styleValue=styleValue+"px";}ele.style[styleName]=styleValue;}getStyle(ele,styleName){returnwindow.getComputedStyle(ele,null)[styleName];}}function$(arg){returnnewJq(arg);}$.cssNumber={animationIterationCount:true,columnCount:true,fillOpacity:true,flexGrow:true,flexShrink:true,fontWeight:true,gridArea:true,gridColumn:true,gridColumnEnd:true,gridColumnStart:true,gridRow:true,gridRowEnd: