for( var i=0; i<100; i++){ ????????document.write( String.fromCharCode(i));//將0-100的askii碼值在頁面中寫出來 }%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% var str = "" ; for( var i=0; i<100; i++){?????????str +=String.fromCharCode(i); } document.write(str);
這兩個for循環(huán)第二個會比第一個優(yōu)化一點嗎？為什么？
qq_唔叫咩_0
2018-05-01 20:42:26
