[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fbYLkkXXUyz2kglS_jDRYS-IwzDOMfCSNqCofkBT4yLE":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-11 17:22:16",5624409,[8,9,10,11],"var reg = \u002F\\d6\u002F","var reg = \\d{6}\\","var reg = \u002F\\d{6}\u002F","var reg = new RegExp("\\d{6}")",{"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","关于正则表达式声明6位数字的邮编,以下代码正确的是",[21,32,41,50,59,68,77,86,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],5624402,[25,26,27,28],"var obj=()","var obj=[]","var obj={}","var obj=\u002F\u002F","以下哪条语句会产生运行错误","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],5624403,[36,37,38,39],"with","parent","class","void","以下哪个单词不属于javascript保留字",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],5624404,[45,46,47,48],"null instanceof Object","null === undefined","null == undefined","null==NaN","请选择结果为真的表达式",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],5624405,[54,55,56,57],"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":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],5624406,[63,64,65,66],"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":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],5624407,[72,73,74,75],"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":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],5624408,[81,82,83,84],"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":87,"createTime":5,"id":6,"options":88,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],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":30,"type":31},[],5624411,[102,103,104,105],"string","undefined","object","String","预测以下代码的输出:var str;alert(typeof str)"]