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<李>
<李>
<李>
二。浮点数的加减乘除
警报(“1024.2,*,1.2,=,”,+,(1024.2,*,0.2); 三。解决方案
//,解决两个浮点数相乘丢失精度问题//,,,第一个参数//,,,第二个参数,
function 和(a, b) {
,,,var weight =, 0;
,,,var aStr =, a.toString ();
,,,var bStr =, b.toString ();
,,,var regex =,/^ \ d + $/;
,,,,
,,,如果(! regex.test (aStr)) {
,,,,,,,weight +=, aStr.split (“。”) [1] . length;,
,,,,,,,aStr =, aStr.replace (“。”, " ");
,,,}
,,,如果(! regex.test(型)){
,,,,,,,weight +=, bStr.split (“。”) [1] . length;
,,,,,,,bStr =, bStr.replace (“。”, " ");
,,,}
,,,return 数量(aStr), *,数量(型),/,Math.pow(10,重量);
} 四。知识点
& lt; script type=" text/javascript祝辞
document . write (Math.floor (0.60), +,“& lt; br /祝辞”)
document . write (Math.floor (0.40), +,“& lt; br /祝辞”)
document . write (Math.floor (5), +,“& lt; br /祝辞”)
document . write (Math.floor (5.1), +,“& lt; br /祝辞”)
document . write (Math.floor (-5.1), +,“& lt; br /祝辞”)
document . write (Math.floor (-5.9))
& lt;/script>
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6 五。学习博文
