[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fPiKyIZzZZd53_g2mouSW3lMizHMxErn35VR3FFfdcUQ":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-06-07 22:57:01",195995232,[8,9,10,11],"null","undefined","NaN","void",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},17,"9eaa8e7569009d8ceb74846cff5b9ba9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5865f7bbb6ac03f4df94010d0b50a871.jpg","Web前端开发","work_44117530","3.2 社会基本矛盾及其运动规律","JavaScript 中,表示空值的数据类型是?( )",[21,32,41,44,53,62,69,77,86,94],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],195995230,[25,26,27,28],"&lt;script href=&quot;script.js&quot;&gt;&lt;\u002Fscript&gt;","&lt;script file=&quot;script.js&quot;&gt;&lt;\u002Fscript&gt;","&lt;script src=&quot;script.js&quot;&gt;&lt;\u002Fscript&gt;","&lt;script link=&quot;script.js&quot;&gt;&lt;\u002Fscript&gt;","在 HTML 中引入外部 JavaScript 文件的正确方式是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],195995231,[36,37,38,39],"var _myVariable = 10","var 1stVariable = 20","var myVariable_1 = 30","var myVariable = 40","以下关于 JavaScript 变量命名,错误的是?( )",{"answer":42,"createTime":5,"id":6,"options":43,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],195995235,[48,49,50,51],"10","25","7","3","已知 var= 5; var= 2;,则 a ** b 的结果是?( )",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],195995239,[57,58,59,60],"if x &gt; 10 { console.log(&quot;大于10&quot;); }","if (x &gt; 10); { console.log(&quot;大于10&quot;); }","if (x &gt; 10) { console.log(&quot;大于10&quot;); }","if { x &gt; 10 } { console.log(&quot;大于10&quot;); }","以下 if 语句语法正确的是?( )",{"answer":63,"createTime":5,"id":64,"options":65,"question":68,"source":30,"type":31},[],195995242,[8,9,66,67],"0","false","函数可以没有返回值,在 JavaScript 中,如果函数没有显式地使用 return 语句,那么函数的返回值是?( )",{"answer":70,"createTime":5,"id":71,"options":72,"question":76,"source":30,"type":31},[],195995245,[73,74,75,51],"1","","2","已知数组 var arr = [1, [2, 3], 4];,那么 arr[1][0] 的值是?( )",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],195995248,[81,82,83,84],"var obj = new Object()","var obj = new Array()","var obj = {name: &quot;Alice&quot;, age: 25}","function Person(name, age) { this.name = name; this.age = age; } var obj = new Person(&quot;Bob&quot;, 30)","以下创建对象的方式中,哪一个是使用对象字面量创建的?( )",{"answer":87,"createTime":88,"id":89,"options":90,"question":93,"source":30,"type":31},[],"2025-06-07 22:57:02",195995254,[51,91,92,66],"4","5","已知数组 var arr = [1, 2, 3, 4];,那么 arr.length 的值是( )",{"answer":95,"createTime":88,"id":96,"options":97,"question":102,"source":30,"type":31},[],195995260,[98,99,100,101],"for...in 循环只能遍历数组","for...in 循环遍历对象时,顺序是固定的","for...in 循环遍历对象时,会遍历出对象的所有属性,包括原型链上的属性","for...in 循环不能遍历对象","以下关于 for...in 循环的说法,正确的是?( )"]