JavaScript就这么回事(JS基础知识整理)

1创建脚本块引用内容程序代码scriptlanguage=”JavaScript”JavaScript代码写在这里面/script2隐藏脚本代码引用内容程序代码scriptlanguage=”JavaScript”!--document.write(“Hello”);//--/script在不支持JavaScript的浏览器中将不执行相关代码3浏览器不支持的时候显示引用内容程序代码noscriptHellotothenon-JavaScriptbrowser./noscript4链接外部脚本文件引用内容程序代码scriptlanguage=”JavaScript”src=/”filename.js”/script5注释脚本引用内容程序代码//Thisisacommentdocument.write(“Hello”);//Thisisacomment/*Allofthisisacomment*/6输出到浏览器引用内容程序代码document.write(“strongHello/strong”);7定义变量引用内容程序代码varmyVariable=“somevalue”;8字符串相加引用内容程序代码varmyString=“String1”+“String2”;9字符串搜索引用内容程序代码scriptlanguage=”JavaScript”!--varmyVariable=“Hellothere”;vartherePlace=myVariable.search(“there”);document.write(therePlace);//--/script10字符串替换引用内容程序代码thisVar.replace(“Monday”,”Friday”);11格式化字串引用内容程序代码scriptlanguage=”JavaScript”!--varmyVariable=“Hellothere”;document.write(myVariable.big()+“br”);document.write(myVariable.blink()+“br”);document.write(myVariable.bold()+“br”);document.write(myVariable.fixed()+“br”);document.write(myVariable.fontcolor(“red”)+“br”);document.write(myVariable.fontsize(“18pt”)+“br”);document.write(myVariable.italics()+“br”);document.write(myVariable.small()+“br”);document.write(myVariable.strike()+“br”);document.write(myVariable.sub()+“br”);document.write(myVariable.sup()+“br”);document.write(myVariable.toLowerCase()+“br”);document.write(myVariable.toUpperCase()+“br”);varfirstString=“MyString”;varfinalString=firstString.bold().toLowerCase().fontcolor(“red”);//--/script12创建数组引用内容程序代码scriptlanguage=”JavaScript”!--varmyArray=newArray(5);myArray[0]=“FirstEntry”;myArray[1]=“SecondEntry”;myArray[2]=“ThirdEntry”;myArray[3]=“FourthEntry”;myArray[4]=“FifthEntry”;varanotherArray=newArray(“FirstEntry”,”SecondEntry”,”ThirdEntry”,”FourthEntry”,”FifthEntry”);//--/script13数组排序引用内容程序代码scriptlanguage=”JavaScript”!--varmyArray=newArray(5);myArray[0]=“z”;myArray[1]=“c”;myArray[2]=“d”;myArray[3]=“a”;myArray[4]=“q”;document.write(myArray.sort());//--/script14分割字符串引用内容程序代码scriptlanguage=”JavaScript”!--varmyVariable=“a,b,c,d”;varstringArray=myVariable.split(“,”);document.write(stringArray[0]);document.write(stringArray[1]);document.write(stringArray[2]);document.write(stringArray[3]);//--/script15弹出警告信息引用内容程序代码scriptlanguage=”JavaScript”!--window.alert(“Hello”);//--/script16弹出确认框引用内容程序代码scriptlanguage=”JavaScript”!--varresult=window.confirm(“ClickOKtocontinue”);//--/script17自定义函数引用内容程序代码scriptlanguage=”JavaScript”!--functionmultiple(number1,number2){varresult=number1*number2;returnresult;}//--/script18调用JS函数引用内容程序代码ahref=”#”onClick=”functionName()”Linktext/aahref=/”javascript:functionName()”Linktext/a19在页面加载完成后执行函数引用内容程序代码bodyonLoad=”functionName();”Bodyofthepage/body20条件判断引用内容程序代码script!--varuserChoice=window.confirm(“ChooseOKorCancel”);varresult=(userChoice==true)?“OK”:“Cancel”;document.write(result);//--/script21指定次数循环引用内容程序代码script!--varmyArray=newArray(3);myArray[0]=“Item0”;myArray[1]=“Item1”;myArray[2]=“Item2”;for(i=0;imyArray.length;i++){document.write(myArray[i]+“br”);}//--/script22设定将来执行引用内容程序代码script!--functionhello(){window.alert(“Hello”);}window.setTimeout(“hello()”,5000);//--/script23定时执行函数引用内容程序代码script!--functionhello(){window.alert(“Hello”);window.setTimeout(“hello()”,5000);}window.setTimeout(“hello()”,5000);//--/script24取消定时执行引用内容程序代码script!--functionhello(){window.alert(“Hello”);}varmyTimeout=window.setTimeout(“hello()”,5000);window.clearTimeout(myTimeout);//--/script25在页面卸载时候执行函数引用内容程序代码bodyonUnload=”functionName();”Bodyofthepage/bodyJavaScript就这么回事2：浏览器输出26访问document对象引用内容程序代码scriptlanguage=”JavaScript”varmyURL=document.URL;window.alert(myURL);/script27动态输出HTML引用内容程序代码scriptlanguage=”JavaScript”document.write(“pHere’ssomeinformationaboutthisdocument:/p”);document.write(“ul”);document.write(“liReferringDocument:“+document.referrer+“/li”);document.write(“liDomain:“+document.domain+“/li”);document.write(“liURL:“+document.URL+“/li”);document.write(“/ul”);/script28输出换行引用内容程序代码document.writeln(“stronga/strong”);document.writeln(“b”);29输出日期引用内容程序代码scriptlanguage=”JavaScript”varthisDate=newDate();document.write(thisDate.toString());/script30指定日期的时区引用内容程序代码scriptlanguage=”JavaScript”varmyOffset=-2;varcurrentDate=newDate();varuserOffset=currentDate.getTimezoneOffset()/60;vartimeZoneDifference=userOffset-myOffset;currentDate.setHours(currentDate.getHours()+timeZoneDifference);document.write(“ThetimeanddateinCentralEuropeis:“+currentDate.toLocaleString());/script31设置日期输出格式引用内容程序代码scriptlanguage=”JavaScript”varthisDate=newDate();varthisTimeString=thisDate.getHours()+“:”+thisDate.getMinutes();varthisDateString=thisDate.getFullYear()+“/”+thisDate.getMonth()+“/”+thisDate.getDate();document.write(thisTimeString+“on“+thisDateString);/script32读取URL参数引用内容程序代码scriptlanguage=”JavaScript”varurlParts=document.URL.split(“?”);varparameterParts=urlParts[1].split(“&”);for(i=0;iparam