千位格式化:就是所谓的金钱格式,数字逢三加一个逗号.比如1000-->1,000 1233333-->1,233,333等等.相信大家都能看懂.
由于javascript支持正向预搜查,那么实现起来就不难了.
这里给出一个可以自己定制规则的思想.比如下面的代码不对以字母,下划线和.开头的数字进行格式化.
- <script type="text/javascript">
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<!--
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String.prototype.commafy = function(){
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return this.replace(/(^|[^\w.])(\d{4,})/g, function($0, $1, $2){
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return $1 + $2.replace(/\d(?=(?:\d\d\d)+(?!\d))/g,"$&,");
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});
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}
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Number.prototype.commafy = function(){
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return String(this).commafy();
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}
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alert((1000).commafy()) // 1,000
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var data = '1\n' +
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'10\n' +
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'100\n' +
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'1000\n' +
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'10000\n' +
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'100000\n' +
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'1000000\n' +
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'12345678901234567890\n' +
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'1000.99\n' +
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'1000.9999\n' +
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'.9999\n' +
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'-1000\n' +
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'$1000\n' +
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'"1000"\n' +
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'1000MHz\n' +
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'Z1000';
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alert(data.commafy());
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/* Output:
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1
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10
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100
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1,000
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10,000
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100,000
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1,000,000
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12,345,678,901,234,567,890
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1,000.99
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1,000.9999
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.9999
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-1,000
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$1,000
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"1,000"
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1,000MHz
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Z1000
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*/
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//-->
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</script>
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