[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fRzi8ni08yegqP8aB9w1gJMGGE09uKALqwKIeF-PSBNQ":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2025-06-07 22:57:02",195995260,[8,9,10,11],"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",{"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","以下关于 for...in 循环的说法,正确的是?( )",[21,33,42,51,60,69,76,84,93,100],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2025-06-07 22:57:01",195995230,[26,27,28,29],"&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":34,"createTime":23,"id":35,"options":36,"question":41,"source":31,"type":32},[],195995231,[37,38,39,40],"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":43,"createTime":23,"id":44,"options":45,"question":50,"source":31,"type":32},[],195995232,[46,47,48,49],"null","undefined","NaN","void","JavaScript 中,表示空值的数据类型是?( )",{"answer":52,"createTime":23,"id":53,"options":54,"question":59,"source":31,"type":32},[],195995235,[55,56,57,58],"10","25","7","3","已知 var= 5; var= 2;,则 a ** b 的结果是?( )",{"answer":61,"createTime":23,"id":62,"options":63,"question":68,"source":31,"type":32},[],195995239,[64,65,66,67],"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":70,"createTime":23,"id":71,"options":72,"question":75,"source":31,"type":32},[],195995242,[46,47,73,74],"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":77,"createTime":23,"id":78,"options":79,"question":83,"source":31,"type":32},[],195995245,[80,81,82,58],"1","","2","已知数组 var arr = [1, [2, 3], 4];,那么 arr[1][0] 的值是?( )",{"answer":85,"createTime":23,"id":86,"options":87,"question":92,"source":31,"type":32},[],195995248,[88,89,90,91],"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":94,"createTime":5,"id":95,"options":96,"question":99,"source":31,"type":32},[],195995254,[58,97,98,73],"4","5","已知数组 var arr = [1, 2, 3, 4];,那么 arr.length 的值是( )",{"answer":101,"createTime":5,"id":6,"options":102,"question":19,"source":31,"type":32},[],[8,9,10,11]]