3*0.1 == 0.3 返回 true还是 false

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3*0.1 == 0.3 返回 true还是 false

返回false因为有些浮点数不能完全精确的表示出来
例如：

1---------------------
1*0.1=0.1
1*0.2=0.2
1*0.3=0.3
1*0.4=0.4
1*0.5=0.5
1*0.6=0.6
1*0.7=0.7
1*0.8=0.8
1*0.9=0.9
1*1.0=1.0
2---------------------
2*0.1=0.2
2*0.2=0.4
2*0.3=0.6
2*0.4=0.8
2*0.5=1.0
2*0.6=1.2
2*0.7=1.4
2*0.8=1.6
2*0.9=1.8
2*1.0=2.0
3---------------------
3*0.1=0.30000000000000004
3*0.2=0.6000000000000001
3*0.3=0.8999999999999999
3*0.4=1.2000000000000002
3*0.5=1.5
3*0.6=1.7999999999999998
3*0.7=2.0999999999999996
3*0.8=2.4000000000000004
3*0.9=2.7
3*1.0=3.0
4---------------------
4*0.1=0.4
4*0.2=0.8
4*0.3=1.2
4*0.4=1.6
4*0.5=2.0
4*0.6=2.4
4*0.7=2.8
4*0.8=3.2
4*0.9=3.6
4*1.0=4.0
5---------------------
5*0.1=0.5
5*0.2=1.0
5*0.3=1.5
5*0.4=2.0
5*0.5=2.5
5*0.6=3.0
5*0.7=3.5
5*0.8=4.0
5*0.9=4.5
5*1.0=5.0
6---------------------
6*0.1=0.6000000000000001
6*0.2=1.2000000000000002
6*0.3=1.7999999999999998
6*0.4=2.4000000000000004
6*0.5=3.0
6*0.6=3.5999999999999996
6*0.7=4.199999999999999
6*0.8=4.800000000000001
6*0.9=5.4
6*1.0=6.0
7---------------------
7*0.1=0.7000000000000001
7*0.2=1.4000000000000001
7*0.3=2.1
7*0.4=2.8000000000000003
7*0.5=3.5
7*0.6=4.2
7*0.7=4.8999999999999995
7*0.8=5.6000000000000005
7*0.9=6.3
7*1.0=7.0
8---------------------
8*0.1=0.8
8*0.2=1.6
8*0.3=2.4
8*0.4=3.2
8*0.5=4.0
8*0.6=4.8
8*0.7=5.6
8*0.8=6.4
8*0.9=7.2
8*1.0=8.0
9---------------------
9*0.1=0.9
9*0.2=1.8
9*0.3=2.6999999999999997
9*0.4=3.6
9*0.5=4.5
9*0.6=5.3999999999999995
9*0.7=6.3
9*0.8=7.2
9*0.9=8.1
9*1.0=9.0
10---------------------
10*0.1=1.0
10*0.2=2.0
10*0.3=3.0
10*0.4=4.0
10*0.5=5.0
10*0.6=6.0
10*0.7=7.0
10*0.8=8.0
10*0.9=9.0
10*1.0=10.0