怎样才能保护自己的js源码呢？

Question

js代码是必须下载到客户端后，本地浏览器执行的吗？
如果是这样，如何才能保护自己的js源码的版权呢？
压缩和混淆吗？目前主流的混淆工具是什么呢？一直在疑惑有些收费的js程序怎么卖钱呢？好像还有展示页面
如果有展示页面我下载下来不久全都download下来了么？

Answer 1

很多那样的展示页面是用Flash做的吧。

Answer 2

压缩一下,有工具的,能把变量换成a,b,c,一般没精力把全部读通的

Answer 3

看看google的js代码，你就知道了！window.google={kEI:"em-rS4e8Eovi7APX5_2tDw",kEXPI:"0",kCSI:{e:"0",ei:"em-rS4e8Eovi7APX5_2tDw",expi:"0"},ml:function(){},kHL:"zh-CN",time:function(){return(new Date).getTime()},log:function(b,d,c){var a=new Image,e=google,g=e.lc,f=e.li;a.onerror=(a.onload=(a.onabort=function(){delete g[f]}));g[f]=a;c=c||"/gen_204?atyp=i&ct="+b+"&cad="+d+"&zx="+google.time();a.src=c;e.li=f+1},lc:[],li:0,Toolbelt:{}};
window.google.sn="webhp";window.google.timers={load:{t:{start:(new Date).getTime()}}};try{window.google.pt=window.external&&window.external.pageT;}catch(u){}window.google.jsrt_kill=1;
var _gjwl=location;function _gjuc(){var b=_gjwl.href.indexOf("#");if(b>=0){var a=_gjwl.href.substring(b+1);if(/(^|&)q=/.test(a)&&a.indexOf("#")==-1&&!/(^|&)cad=h($|&)/.test(a)){_gjwl.replace("/search?"+a.replace(/(^|&)fp=[^&]*/g,"")+"&cad=h");return 1}}return 0}function _gjp(){!(window._gjwl.hash&&window._gjuc())&&setTimeout(_gjp,500)};
window._gjp && _gjp()</script><style>td{line-height:.8em;}.gac_m td{line-height:17px;}form{margin-bottom:20px;}body,td,a,p,.h{font-family:arial,sans-serif}.h{color:#36c;font-size:20px}.q{color:#00c}.ts td{padding:0}.ts{border-collapse:collapse}em{color:#c03;font-style:normal;font-weight:normal}a em{text-decoration:underline}.lst{font:17px arial,sans-serif;margin-bottom:.2em;vertical-align:bottom;}input{font-family:inherit}.lsb,.gac_sb{font-size:15px;height:1.85em!important;margin:.2em;overflow:visible;padding:0 20px;}#gbar,#guser{font-size:13px;padding-top:1px !important}#gbar{float:left;height:22px}#guser{padding-bottom:7px !important;text-align:right}.gbh,.gbd{border-top:1px solid #c9d7f1;font-size:1px}.gbh{height:0;position:absolute;top:24px;width:100%}#gbs,.gbm{background:#fff;left:0;position:absolute;text-align:left;visibility:hidden;z-index:1000}.gbm{border:1px solid;border-color:#c9d7f1 #36c #36c #a2bae7;z-index:1001}.gb1{margin-right:.5em}.gb1,.gb3{zoom:1}.gb2{display:block;padding:.2em .5em;}.gb2,.gb3{text-decoration:none;border-bottom:none}a.gb1,a.gb2,a.gb3,a.gb4{color:#00c !important}a.gb2:hover{background:#36c;color:#fff !important}</style><script>google.y={};google.x=function(e,g){google.y[e.id]=[e,g];return false};if(!window.google)window.google={};window.google.crm={};window.google.cri=0;window.clk=function(d,e,f,j,k,l,m){if(document.images){var a=encodeURIComponent||escape,b=new Image,g=window.google.cri++;window.google.crm[g]=b;b.onerror=(b.onload=(b.onabort=function(){delete window.google.crm[g]}));b.src=["/url?sa=T","",e?"&oi="+a(e):"",f?"&cad="+a(f):"","&ct=",a(j||"res"),"&cd=",a(k),"&ved=",a(m),d?"&url="+a(d.replace(/#.*/,"")).replace(/\+/g,"%2B"):"","&ei=","em-rS4e8Eovi7APX5_2tDw",l].join("")}
return true};
window.gbar={qs:function(){},tg:function(e){var o={id:'gbar'};for(i in e)o[i]=e[i];google.x(o,function(){gbar.tg(o)})}};

Answer 4

能够下载到客户部分的,想做到保密,基本上都不现实.
但是你可以把别人查阅的难度加大.
比如,通过ajax来载入一些函数,等等.