[incubator-echarts] 02/02: style: add comment

[ov...@apache.org]

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ovilia pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-echarts.git

commit d5c25225872c491002d7cff3b104746041becf2a
Author: Ovilia <zw...@gmail.com>
AuthorDate: Fri Oct 25 14:37:01 2019 +0800

    style: add comment
---
 src/util/number.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/util/number.js b/src/util/number.js
index aecd858..cf84e9a 100644
--- a/src/util/number.js
+++ b/src/util/number.js
@@ -399,6 +399,11 @@ export function quantityExponent(val) {
     }
 
     var exp = Math.floor(Math.log(val) / Math.LN10);
+    /**
+     * exp is expected to be the rounded-down result of the base-10 log of val.
+     * But due to the precision loss with Math.log(val), we need to restore it
+     * using 10^exp to make sure we can get val back from exp. #11249
+     */
     if (val / Math.pow(10, exp) >= 10) {
         exp++;
     }


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