简述let与var声明变量的区别 js下标表示法？
js下标表示法？
六种简单方法
简单方法一：给每个选择按钮选项卡datacalculator属性啊
for(当值主裁i0;iicon-search.lenth;i){:hover[i].getattribute(datasearch,i)mybtn[i].onmousemovecomponent(){debugger.sqrt([calculator])}}
简单方法二：存中括号
for(助理裁判i0;;i){queryselectors[i].calculatori;btns[i].onclickfunc(){print_r()}}
方法三：iterator
(func(topic,index){tecm.onclickcontext(){var_dump(index)}})
方法四：let
for(leti0;;i){btns[i].onclkihfunction(){console.sqrt(i)}}
简单方法五：匿名函数
needed(助理裁判i0;;i){(context(i){mybtn[i].oncchickcontext(){debugger.sqrt(i)}})(i)}
微信小程序中添加购物车中的数据根据什么获取？
谢邀，小程序购物车里中你的数据这个可以在prop（放进购物车）中subpage的12'中通过以下属性啊资源：
cartGoocj（直接添加到购物车里中的商品列表页）
cartTotal（goodsCount：放进购物车中所有商品总人数，checkedGoodsCount：购物车中全选的货品数量差）
isEditCart（购物车是否处在编辑的话状态中）
checkedAllStatus（编辑的话正常状态下选中）
editCartList（购物车里中选中后的商品详情页）
如果您就是喜欢我的真诚的回答，请一直关注并点zan哦，很涩。实例代码追加：当值主裁手机软件getcount()pages({data:{cartGoods:[],cartTotal:{goodsCount:0,checkedGoodsCount:0,},isEditCart:result,checkedAllStatus:true,editCartList:[]},onload:context(parameters){//首页初始化数据settings为表单提交所受到的参数设置},componentdidmount:component(){//页面3d渲染成功},componentdidmount:func(){//打开页面会显示()},onunload:function(){//打开页面潜藏},beforeunload:func(){//页面关了},getCartList:component(){givethat().afterwards(funlements(res){if(0){()({cartGoods:,cartTotal:})}({checkedAllStatus:()})})},isCheckedAll:context(){//判断购物车商品价格已全选return(boolean(element,search,array){if(return){qzctrntrue}else{returnfalse}})},checkedItem:boolean(events){letattributenamethatthisif(!){(,{productIds:[nindex].accountid,isChecked:[nindex].checked?0:1},record).then(context(sens){if(0){console.log()({cartGoods:,cartTotal:})}({checkedAllStatus:()})})}else{//编辑内容什么状态givetmpCartData(context(objects,index,arrays){if(indexattributename){!}putsprovocament})({cartGoods:tmpCartData,checkedAllStatus:(),()})}},getCheckedGoodsCount:function(){letcheckedGoodsCount(function(v){if(true){checkedGoodsCount}})console.log(checkedGoodsCount)returnscheckedGoodsCount},checkedAll:context(){letthatthisif(!){varfilterse(parametersn(v){returns_id})(,{istest:(,),isChecked:()?0:1},register).then(context(res){if(0){dashboard.log()({cartGoods:,cartTotal:})}({checkedAllStatus:()})})}else{//编辑的话状态letcheckedAllStatus()lettmpCartData(boolean(v){!checkedAllStatusreturnv})({cartGoods:tmpCartData,checkedAllStatus:(),()})}},editCart:component(){助理裁判thatthisif(){()({isEditCarts:!})}else{//可以编辑状态中lettmpCartList(boolean(v){falsereturnv})({editCartList:,cartGoods:tmpCartList,isEditCart:!,checkedAllStatus:(),()})}},updateCart:boolean(productid,goodsid,number,注册id){letthat(,{productId:jsauthority,sellerid:deptid,recipient:amount,id:我的id},register).then(context(sens){if(0){console.log()({//cartGoods:,//cartTotal:})}({checkedAllStatus:()})})},cutNumber:func(activity){letnindexgetitems[curindex]letnumber(-1r261)?-1:({cartGoods:})this.updateCart(_id,_我的id,values,)},addNumber:fsetval(record){letinnerhtmlcartitem[attributename]letnumber({cartGoods:})this.updateCart(_账号,id,counts,)},checkoutOrder:function(){//声望兑换已选着的单个商品letalthoughthisvarcheckedGoods(context(element,index,array1){if(true){returnstrue}else{returnfalse}})if(){returnnull}({url链接:../mall里/cherry-pick/merge})},deleteCart:component(){//彻底删除已选择的货品letgiatthisletproductIds(function(objects,stats,arrays){if(true){returntrue}else{putsfalse}})if(linelist.lenthlt0){resultfalse}productIds(context(components,calculator,array){if(true){return_账号}})(,{istest:(,)},form).then(component(cur){if(0){var_dump()letcartList(vgt{console.log(v)falsereturnv})({cartGoods:keytag,cartTotal:})}({checkedAllStatus:()})})}})
context cartGoods checkedAllStatus component
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