思路一: if(pi===undefined){pi=3.14;} var s=pirr;
return s;
思路二: if(arguments.length<2){pi=3.14} var s=pirr;
思路一改进: if(!pi){pi=3.14;} var s=pirr; return s;
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思路一: if(pi===undefined){pi=3.14;} var s=pirr;
return s;
思路二: if(arguments.length<2){pi=3.14} var s=pirr;
return s;