[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fIMTFSeqgzFMvicRttR8vQ2_kTptqN5WdBHa3T5DRS4g":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2023-05-11 17:22:16",5624402,[8,9,10,11],"var obj=()","var obj=[]","var obj={}","var obj=\u002F\u002F",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},53,"8ea380b3efcc50065f6d7945a4251f2f","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0a3f68cb63f3415c0784a5e1679f97e1.jpg","Web服务器端开发","c9d0a21aaea442758ab7c843c30214d0","JavaScript回顾","以下哪条语句会产生运行错误",[21,26,35,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],5624403,[30,31,32,33],"with","parent","class","void","以下哪个单词不属于javascript保留字",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":25},[],5624404,[39,40,41,42],"null instanceof Object","null === undefined","null == undefined","null==NaN","请选择结果为真的表达式",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":24,"type":25},[],5624405,[48,49,50,51],"var obj = [name:"zhangsan",show:function(){alert(name);}]","var obj = {name:"zhangsan",show:"alert(this.name)"}","var obj = {name:"zhangsan",show:function(){alert(name);}}","var obj = {name:"zhangsan",show:function(){alert(this.name);}}","声明一个对象,给它加上name属性和show方法显示其name值,以下代码中正确的是",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":24,"type":25},[],5624406,[57,58,59,60],"window.status="已经选中该文本框"","document.status="已经选中该文本框"","window.screen="已经选中该文本框"","document.screen="已经选中该文本框"","要将页面的状态栏中显示"已经选中该文本框",下列JavaScript语句正确的是",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":24,"type":25},[],5624407,[66,67,68,69],"for(var i=0;i< form1.elements.length;i++) {if(form1.elements[i].type=="text") form1.elements[i].value=""; }","for(var i=0;i<document.forms.length;i++) {if(forms[0].elements[i].type=="text") forms[0].elements[i].value=""; }","if(document.form.elements.type=="text") form.elements[i].value=""","for(var i=0;i<document.forms.length; i++){ for(var j=0;j<document.forms[i].elements.length; j++){ if(document.forms[i].elements[j].type=="text") document.forms[i].elements[j].value=""; } }","下面的JavaScript语句中,( )实现检索当前页面中的表单元素中的所有文本框,并将它们全部清空",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":24,"type":25},[],5624408,[75,76,77,78],"var str= form1.fname.value; if(str.substr(0,4)!="010-" || str.substr(4).length!=8 || isNaN(parseFloat(str.substr(4)))) alert("无效的电话号码!")","var str= form1.fname.value; if(str.substr(0,4)!="010-" && str.substr(4).length!=8 && isNaN(parseFloat(str.substr(4)))) alert("无效的电话号码!")","var str= form1.fname.value; if(str.substr(0,3)!="010-" || str.substr(3).length!=8 || isNaN(parseFloat(str.substr(3)))) alert("无效的电话号码!")","var str= form1.fname.value; if(str.substr(0,4)!="010-" && str.substr(4).length!=8 && !isNaN(parseFloat(str.substr(4)))) alert("无效的电话号码!")","在表单(form1)中有一个文本框元素(fname),用于输入电话号码,格式如:010-82668155,要求前3位是010,紧接一个"-",后面是8位数字.要求在提交表单时,根据上述条件验证该文本框中输入内容的有效性,下列语句中,能正确实现以上功能的是",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":24,"type":25},[],5624409,[84,85,86,87],"var reg = \u002F\\d6\u002F","var reg = \\d{6}\\","var reg = \u002F\\d{6}\u002F","var reg = new RegExp("\\d{6}")","关于正则表达式声明6位数字的邮编,以下代码正确的是",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":24,"type":25},[],5624410,[93,94,95,96],"<script>","<javascript>","<js>","<scripting>","我们可以在下列哪个标记中放置js代码",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":24,"type":25},[],5624411,[102,103,104,105],"string","undefined","object","String","预测以下代码的输出:var str;alert(typeof str)"]