javascript程序设计之js调试_javascript技巧

javascript程序设计之js调试_javascript技巧

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时间:2019-01-03

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1、JavaScript程序设计之JS调试木文主要通过一个加法器,介绍JS如何调试。先上代码:效果:Clocalhost:63342/WebLearn/JS/demo1/test>html应用★BookmarksGGoogle曲百麦一下,你就知逍B<日常一you计算器test,html:〈htmlIan萨〃en">计算器</t</p><p>2、itle></head><body><div><h2>计算器</h2><div>〈inputtype二〃text〃id二〃numl〃><span>+〈/span><inputtype二"text"id="num2〃><span>=</span><spanid二〃:resuIt">〈/span><buttonid二〃add〃>计算</button></div></div><scriptsrc=〃・/demo.js〃>〈/script></body></html></span>demo,js<spanstyle=,zfont-</p><p>3、family:ComicSansMS;font-size:18px;z/>/***Createdbyyanzion15/12/8.*/varnuml=document•getElementByTd(ml〃),num2二documcnt.gctElcmcntById(m2"),result=document.getElementByld(z,result/z),btn_add=document.getElementB)dd(z,add/z);btn_add.addEventListener(〃click〃,onAddClic</p><p>4、k,false);functiononAddClick(){vara=parselnt(numl.value),b=parselnt(num2.value);varsum二add(a,b);result.innerHTML=sum;*@parama*@paramb*©returns{*}*/functionadd(a,b){returna+b;}</span>重点摘要:1、一般调试JS,打印信息有如下三种:a.用alert,缺点是每次都弹框b.用console,log,这个数据量小还叮以c・加断点调试2、在JS里,如果变量</p><p>5、前而加var,表示局部变量,function里如果不带var表示全局变量。因此一般情况下变量前面带阳匕3、一般在chrome调试器里,elements看代码,在source0录下进行调试。在该模式下,点击js里每一行即可以加断点。<htmllang=°enM>»"shadow-root(open)►head/headbodvh2>计算S</h2>►<div>^</div><scriptsrc=n,/demo>isux/script></body></html>StylesComputedEventListensFilter</p><p>6、element.style{}body{userdisplay:block;margin:»8px;}4、调试模式下最右边的四个按钮分别是:下一个断点处,单步执行,进到下一函数,跳出函数。基木所有的调试工具都有这四种。ElementsConsoleSourcesNetworkTimelineProfilesResourcesAuditsSourcesContentscriptsSnippets±test.htmldemo.jsx0]►watch▼Olocalhost:63342▼匚Web_Learn/JS/demoldem</p><p>7、o.jsetest.html12345678901/***Createdbyyanzion15/12/8.*/varnuml二document.getElerrentById(Nnumnum2二document•getElerrentById(Mnumresult=document.getElementByldC1rvarbtn_add=document•getElementByldC'▼CallStackNotPaust▼ScopeNotPausibtn_add・BddEventListener("clickJfunct</p><p>8、iononAddCUckt){onAdd13141516171819a=parseInt(numl.value);b=parseInt(num2.value);surn=add(afb);resulteinnerHTML=sum;}functionadd(a#b){returna+b;}▼Breakpo</p> 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