如何在一个网站或者一个页面，去书写你的JS代码

// JavaScript Document

//如何在一个网站或者一个页面，去书写你的JS代码：

//1.js的分层(功能) : jquery(tools) 组件(ui) 应用(app), mvc(backboneJs) //2.js的规划(管理) : 避免全局变量和方法(命名空间，闭包，面向对象) , 模块化(seaJs,requireJs)
window.onload = function(){ mv.app.toTip(); mv.app.toBanner(); mv.app.toSel(); mv.app.toRun(); }; var mv = {};  //命名空间
mv.tools = {}; mv.tools.getByClass = function(oParent,sClass){ var aEle = oParent.getElementsByTagName('*'); var arr = []; for(var i=0;i<aEle.length;i++){ if(aEle[i].className == sClass){ arr.push(aEle[i]); } } return arr; }; mv.tools.getStyle = function(obj,attr){ if(obj.currentStyle){ return obj.currentStyle[attr]; } else{ return getComputedStyle(obj,false)[attr]; } }; mv.ui = {}; mv.ui.textChange = function(obj,str){ obj.onfocus = function(){ if(this.value == str){ this.value = ''; } }; obj.onblur = function(){ if(this.value == ''){ this.value = str; } }; }; mv.ui.fadeIn = function(obj){ var iCur = mv.tools.getStyle(obj,'opacity'); if(iCur==1){ return false; } var value = 0; clearInterval(obj.timer); obj.timer = setInterval(function(){ var iSpeed = 5; if(value == 100){ clearInterval(obj.timer); } else{ value += iSpeed; obj.style.opacity = value/100;
obj.style.filter = 'alpha(opacity='+value+')'; } },30); }; mv.ui.fadeOut = function(obj){ var iCur = mv.tools.getStyle(obj,'opacity'); if(iCur==0){ return false; } var value = 100; clearInterval(obj.timer); obj.timer = setInterval(function(){ var iSpeed = -5; if(value == 0){ clearInterval(obj.timer); } else{ value += iSpeed; obj.style.opacity = value/100;
obj.style.filter = 'alpha(opacity='+value+')'; } },30); }; mv.ui.moveLeft = function(obj,old,now){ clearInterval(obj.timer); obj.timer = setInterval(function(){ var iSpeed = (now - old)/10;
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed); if(now == old){ clearInterval(obj.timer); } else{ old += iSpeed; obj.style.left = old + 'px'; } },30); }; mv.app = {}; mv.app.toTip = function(){ var oText1 = document.getElementById('text1'); var oText2 = document.getElementById('text2'); mv.ui.textChange(oText1,'Search website'); mv.ui.textChange(oText2,'Search website'); }; mv.app.toBanner = function(){ var oDd = document.getElementById('ad'); var aLi = oDd.getElementsByTagName('li'); var oPrevBg = mv.tools.getByClass(oDd,'prev_bg')[0]; var oNextBg = mv.tools.getByClass(oDd,'next_bg')[0]; var oPrev = mv.tools.getByClass(oDd,'prev')[0]; var oNext = mv.tools.getByClass(oDd,'next')[0]; var iNow = 0; var timer = setInterval(auto,3000); function auto(){ if(iNow == aLi.length-1){ iNow = 0; } else{ iNow++; } for(var i=0;i<aLi.length;i++){ mv.ui.fadeOut(aLi[i]); } mv.ui.fadeIn(aLi[iNow]); } function autoPrev(){ if(iNow == 0){ iNow = aLi.length-1; } else{ iNow--; } for(var i=0;i<aLi.length;i++){ mv.ui.fadeOut(aLi[i]); } mv.ui.fadeIn(aLi[iNow]); } oPrevBg.onmouseover = oPrev.onmouseover = function(){ oPrev.style.display = 'block'; clearInterval(timer); }; oNextBg.onmouseover = oNext.onmouseover = function(){ oNext.style.display = 'block'; clearInterval(timer); }; oPrevBg.onmouseout = oPrev.onmouseout = function(){ oPrev.style.display = 'none'; timer = setInterval(auto,3000); }; oNextBg.onmouseout = oNext.onmouseout = function(){ oNext.style.display = 'none'; timer = setInterval(auto,3000); }; oPrev.onclick = function(){ autoPrev(); }; oNext.onclick = function(){ auto(); }; }; mv.app.toSel = function(){ var oSel = document.getElementById('sel1'); var aDd = oSel.getElementsByTagName('dd'); var aUl = oSel.getElementsByTagName('ul'); var aH2 = oSel.getElementsByTagName('h2'); for(var i=0;i<aDd.length;i++){ aDd[i].index = i; aDd[i].onclick = function(ev){ var ev = ev || window.event; var This = this; for(var i=0;i<aUl.length;i++){ aUl[i].style.display = 'none'; } aUl[this.index].style.display = 'block'; document.onclick = function(){ aUl[This.index].style.display = 'none'; }; ev.cancelBubble = true; }; } for(var i=0;i<aUl.length;i++){ aUl[i].index = i; (function(ul){ var aLi = ul.getElementsByTagName('li'); for(var i=0;i<aLi.length;i++){ aLi[i].onmouseover = function(){ this.className = 'active'; }; aLi[i].onmouseout = function(){ this.className = ''; }; aLi[i].onclick = function(ev){ var ev = ev || window.event; aH2[this.parentNode.index].innerHTML = this.innerHTML; ev.cancelBubble = true; this.parentNode.style.display = 'none'; }; } })(aUl[i]); } }; mv.app.toRun = function(){ var oRun = document.getElementById('run1'); var oUl = oRun.getElementsByTagName('ul')[0]; var aLi = oUl.getElementsByTagName('li'); var oPrev = mv.tools.getByClass(oRun,'prev')[0]; var oNext = mv.tools.getByClass(oRun,'next')[0]; var iNow = 0; oUl.innerHTML += oUl.innerHTML; oUl.style.width = aLi.length * aLi[0].offsetWidth + 'px'; oPrev.onclick = function(){ if(iNow == 0){ iNow = aLi.length/2;
oUl.style.left = -oUl.offsetWidth/2 + 'px';
} mv.ui.moveLeft(oUl,-iNow*aLi[0].offsetWidth,-(iNow-1)*aLi[0].offsetWidth); iNow--; }; oNext.onclick = function(){ if(iNow == aLi.length/2){
iNow = 0; oUl.style.left = 0; } mv.ui.moveLeft(oUl,-iNow*aLi[0].offsetWidth,-(iNow+1)*aLi[0].offsetWidth); iNow++; }; };