AI代码解释 functionfoo(){}console.log(typeof8);// numberconsole.log(typeoffoo);// functionconsole.log(typeof("nfit"));// stringconsole.log(typeofjQuery);// undefinedconsole.log(typeof1===1);// false 注意console.log(typeof(1===1));//booleanconsole.log(typeof/\w+/g);// object...
classList 1.classList.length // 返回包含元素的个数 2.classList.remove() //接收一个类名,从列表中删除给定类名 3.classList.toggle() //如果列表中存在给定的值,删除它,否则添加它 4.classList.add() //将给定的字符串添加到列表中,如果已经存在,就不添加 5.classList.contains() //表明列表中是否...
var num = 10; var str = "string"; var flag = true; 合成类型:对象 var user = { name = "zd" age = 20; onWork = true; job = {}; list = ["1","2"] } undefined和null一般看做特殊值,没有什么特殊意义 var hello = null; var world = undefined; 七、typeof运算符 DOM: 是...
复制 ② String charAt(n)// 返回给定位置的字符charCodeAt(n)// 返回给定位置的字符编码"dddd"[n]// 访问字符串特定索引的字符concat()//用于将一个或多个字符串拼接起来slice(start,end)/substring(start,end)// 返回一个新的从开始位置到结束位置的字符串,不包括结束位置substr(start,len)// 返回一个新...
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Normally, we can have different ways to state the SDK version, it depends on your service and design. Using Query String path.http://xxx.com/sdk.js?v=1.0.0 Using the Folder Naming.http://xxx.com/v1.0.0/sdk.js Using hostname (subdomain).http://v1.xxx.com/sdk.js For the ...
// string sFlop now contains: // "Flop: [Ace of Hearts] [King of Spades] [Seven of Clubs]" 10.循环中标签的使用 有的时候,循环中又嵌套了循环,你可能想在循环中退出,则可以用标签: outerloop: for (var iI=0;iI<5;iI++) { if (somethingIsTrue()) { ...
range.selectNode(document.querySelector("div"));constrectList = range.getClientRects();constoutput =document.querySelector("#output");for(constrectofrectList) { output.textContent=`${ output.textContent}\n${ rect.width}:${ rect.height}`; ...
ios用户当更新到iOS14后,我们的iPhone等ios设备支持我们用户自定义桌面小物件(又或者称之为小组件、桌面挂件),利用这个特性,网上出现了许许多多诸如透明...
JavaScript Issue No. 9: Providing a String As the First Argument tosetTimeoutorsetInterval For starters, let’s be clear on something here: Providing a string as the first argument tosetTimeoutorsetIntervalisnotitself a mistake per se. It is perfectly legitimate JavaScript code. The issue he...