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JavaScript for loop

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JavaScript ??

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document.write(cars[0] + "
")
document.write(cars[1] + "
");
document.write(???[2] + "
");
document.write(???[3] + "
")
document.write(???[4] + "
"); cars[5] + "
");

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JavaScript? ??? ??? ??? ?????.

for - ?? ???? ?? ??? ?????.

for/in - ?? ?? ??? ??

while - ??? ??? true? ? ??? ?? ??? ?????.

do/while - ??? ??? true? ? ??? ?? ??? ?????.

For ??

for ??? ?? ???? ????. ?? ??? ??? ?? ? ?????.

for ??? ??? ??? ????.

for(??? 1; ??? 2; ??? 3)

{
??? ?? ??
}

statement 1(?? ??)? ?????.

statement 2 ?? ? ??(?? ??)? ???? ??? ?????

? 3? ??(?? ??)? ??? ? ????? 

點(diǎn)擊按鈕循環(huán)代碼5次。點(diǎn)擊這里function myFunction(){
    var x="";
    for (var i=0;i";
    }
    document.getElementById("demo").innerHTML=x;
}
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||
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <p>點(diǎn)擊下面的按鈕，循環(huán)遍歷對(duì)象 "person" 的屬性。</p> <button onclick="myFunction()">點(diǎn)擊這里</button> <p id="demo"></p> <script> function myFunction(){ var x; var txt=""; var person={fname:"Bill",lname:"Gates",age:56}; for (x in person){ txt=txt + person[x]; } document.getElementById("demo").innerHTML=txt; } </script> </body> </html>