js 学习之路6: if…else…条件语句的使用

1.1

if (...)

{

...

}

else

{

...

}

<!DOCTYPE html><html><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><body><script charset = "utf-8">function myfunction(){ var x = 11; var y = x % 2; document.write(y + "<br>"); if (x % 2 == 1){ document.write("单数"); } else { document.write("双数"); }}myfunction();</script></body></html>

1.2

if (条件1)

{

...

}

else if (条件2)

{

...

}

else

{

...

}

<!DOCTYPE html><html><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><body><script charset = "utf-8">function myfunction(x){ var y = x % 2; if (x % 2 == 0){ document.write("双数"); } else if (x > 10) { document.write("大于10的单数"); } else { document.write("普通单数"); } document.write("<br>"); document.write(x);}myfunction(15);</script></body></html>

 

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