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a+=5 ,同a = a+5
a-=5 ,同a = a-5
a*=5 ,同a = a*5
a/=5 ,同a = a/5

範例:
var a =10;
document.write("a+=5為:"+(a+=5));
document.write("<br>" );

document.write("a-=5為:"+(a-=5));
document.write("<br>" );

document.write("a*=5為:"+(a*=5));
document.write("<br>" );

document.write("a/=5為:"+(a/=5));
document.write("<br>" );


結果:







 
















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