文字列演算子「dの値は(1)」


Dの値は?
var a = 15,b = -10,d;
d = a + b + 'c'
;

<SCRIPT LANGUAGE=javascript> 
<!-- 
var a = 15,b = -10,d; 
d = a + b + "c"; 
document.write("d = " + d + "<br>"); 
//--> 
</SCRIPT>



01/02/13更新

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