What does this mean when the javascript timer changes to a 16-bit floating point number after accumulating a decimal number?

What does this mean when the javascript timer changes to a 16-bit floating point number after accumulating a decimal number? Please refer to this: {code...} is printed like this: 1.11.200000000000000000021.300000000000000000031.400000000000000000041.500000000000000000041.6000000000000005. Does this mean that the javascript timer will change to a 16-bit floating point number after adding?
See this:

var startNum = 1;    setInterval(function ()    {        startNum += 0.1;        console.log(startNum);    }, 500);

The output is as follows:
1.1
1.2000000000000002
1.3000000000000003
1.4000000000000004
1.5000000000000004
1.6000000000000005

Is this a pitfall? Depressed.

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What does this mean when the javascript timer changes to a 16-bit floating point number after accumulating a decimal number?
See this:

var startNum = 1;    setInterval(function ()    {        startNum += 0.1;        console.log(startNum);    }, 500);

The output is as follows:
1.1
1.2000000000000002
1.3000000000000003
1.4000000000000004
1.5000000000000004
1.6000000000000005

Is this a pitfall? Depressed.

It's normal. This is caused by precision. Do not believe it. Try 0.1 + 0.2 not equal to 0.3.

Http://segmentfault.com/q/1010000000137297

Look at this standard http://www.baidu.com/link? Url = ax1PkOuwwFU_KTyr29jOuhSr9v-i-Zg8fqAqty9Xbo_2oLAYg-_ blank & wd = & eqid = 9ac65804000049bc00000005568e60b4

To use programming languages to calculate decimals, it is best to convert them into integers first.