示例代码：
<!DOCTYPE html>
<html lang="zh"><head><meta charset="UTF-8" /><title>js比较数字相等</title></head><body><script type="text/javascript">//设置误差范围值--机器精度（对于js来说是2^-52）//ES6定义了Number.EPSILON，之前未定义Number.EPSILONif(!Number.EPSILON) {Number.EPSILON = Math.pow(2, -52)}function numberCloseEnoughToEqual(a, b) {return(a - b) < Number.EPSILON;}console.log(numberCloseEnoughToEqual((0.1 + 0.2), 0.3)); //true</script></body></html>
 - 体系架构)
