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<title>js已知正切值求角度</title>
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JS 已知tan的值，如何求对应的角度
<br> 也就是谁 tan x = y; 知道y的值，如何求x?
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
<script>
function getTanDeg(tan) {
var result = Math.atan(tan) / (Math.PI / 180);
result = Math.round(result);
return result;
}
var result = getTanDeg(1);
console.log(result); // 45度
</script>
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