javascript中函数重载的问题

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<html><head><title></title><script>/*//求和function sum(a,b){var c = a + b;return c;}function sum(x,y,z){return x + y + z;}var x = 10 ;var y = 20 ;var z = sum(x,y);//NaNalert(z);var v = 10;var w = 50;var h = 40;var r = sum(v,w,h);//100alert(r);*///求和function sum(x,y,z){return x + y + z;}function sum(a,b){var c = a + b;return c;}var x = 10 ;var y = 20 ;var z = sum(x,y);//30alert(z);var v = 10;var w = 50;var h = 40;var r = sum(v,w,h);//60alert(r);/*注意:(1)js中没有函数重载(2)js中如果出现同名函数,最后的覆盖前面的(3)js函数的参数中,如果形式参数只有2个,传入的实际参数是3个,则只计算前两个数*/</script></head><body><!--事件响应--><input type ="button" value="click" onclick="show()"/></body></html>

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