JS案例：通过do...while循环求1到100的偶数累加和
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<title>do...while语句应用案例</title>
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<script type="text/javascript">
var i=2,sum=0;//i是循环变量，初值2；而sum是和，初值0
do
{
sum += i;
i=i+2
} while (i<=100);
alert("2+4+6+...+100="+sum);
</script>
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