我想把购物车里商品数量设置为一个按键的形式,自己点击自动增加。
这个php语言应该怎么写。
回复讨论(解决方案)
这个最好用js来写,php可以利用ajax+js实现点击自增
要用JS写啊 按钮绑定一个事件 点击触发自增事件
这个是jquery的效果,跟php无关
http://www.cnblogs.com/wifi/articles/2587746.html
这个应该用js来写。最后提交到php
js:
<script> <br /> function gwsubmit(obj) <br /> { <br /> document.form1.submit(); <br /> } <br /> function ifsission(){ <br /> var xmlhttp; <br /> if (window.XMLHttpRequest){ <br /> // code for IE7+, Firefox, Chrome, Opera, Safari <br /> xmlhttp=new XMLHttpRequest(); <br /> } <br /> else{ <br /> // code for IE6, IE5 <br /> xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); <br /> } <br /> xmlhttp.onreadystatechange=function(){ <br /> if (xmlhttp.readyState==4&& xmlhttp.status==200){ <br /> var str=xmlhttp.responseText; <br /> if(str==0){ <br /> if(confirm("你还未注册,是否注册!")==true){ <br /> window.location.href="register.php"; <br /> }else{ <br /> window.location.href="#"; <br /> } <br /> }else{ <br /> document.myform.submit(); <br /> } <br /> } <br /> } <br /> xmlhttp.open("GET","session.php",true); <br /> xmlhttp.send(); <br /> } <br /> function fnnum(num){ <br /> var obj=document.getElementById("num"); <br /> var re=document.getElementById("remain"); <br /> if(num==1){ <br /> if(obj.value>1){ <br /> obj.value=obj.value-1; <br /> if(obj.value==1){ <br /> document.getElementById("jian").style.color="#CCC"; <br /> } <br /> document.getElementById("jia").style.color="black"; <br /> } <br /> }else if(num==2){ <br /> if(parseInt(obj.value)<parseInt(re.innerHTML)){ <br /> obj.value++; <br /> if(obj.value==re.innerHTML){ <br /> document.getElementById("jia").style.color="#CCC"; <br /> } <br /> document.getElementById("jian").style.color="black"; <br /> } <br /> } <br /> } <br /> function fnchange(obj){ <br /> var re=document.getElementById("remain"); <br /> if(parseInt(obj.value)>parseInt(re.innerHTML)){ <br /> document.getElementById("non").style.display="block"; <br /> document.getElementById("jia").style.color="#CCC"; <br /> obj.value=1; <br /> }else{ <br /> document.getElementById("non").style.display="none"; <br /> if(parseInt(obj.value)==parseInt(re.innerHTML)){ <br /> document.getElementById("jia").style.color="#CCC"; <br /> }else{ <br /> document.getElementById("jia").style.color="black"; <br /> } <br /> if(parseInt(obj.value)<=1){ <br /> obj.value=1; <br /> document.getElementById("jian").style.color="#CCC"; <br /> }else{ <br /> document.getElementById("jian").style.color="black"; <br /> } <br /> } <br /> } <br /> </script>
表单:

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

You should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.

Yes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching

ThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl


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