toLocaleString：
// A more complex example:
number.toLocaleString(); // "1,234,567,890"
// A more complex example:
var number2 = 1234.56789; // floating point example
number2.toLocaleString(undefined, {maximumFractionDigits:2}) // "1,234.57"
（不支持Safari）：
var nf = new Intl.NumberFormat();
nf.format(number); // "1,234,567,890"
var number = 1234567890; //要转换的示例编号
?记住javascript的最大整数值为9007199254740991
https://css-tricks.com/snippets/javascript/comma-values-in- numbers/
2345643.00将返回2,345,643.00
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