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数字的千分位格式化方法

方法一:数组(字串)循环法

 1 function toThousands(num) { 2     var result = [ ], counter = 0; 3     num = (num || 0).toString().split(‘‘); 4     for (var i = num.length - 1; i >= 0; i--) { 5         counter++; 6         result.unshift(num[i]); 7         if (!(counter % 3) && i != 0) {  8                 result.unshift(‘,‘);  9         }10     }11     return result.join(‘‘);12 }
 1 function toThousands(num) { 2     var result = ‘‘, counter = 0; 3     num = (num || 0).toString(); 4     for (var i = num.length - 1; i >= 0; i--) { 5         counter++; 6         result = num.charAt(i) + result; 7         if (!(counter % 3) && i != 0) {  8                 result = ‘,‘ + result;  9         }10     }11     return result;12 }

方法二:字串截取法

 1 function toThousands(num) { 2     var num = (num || 0).toString(), result = ‘‘; 3     while (num.length > 3) { 4         result = ‘,‘ + num.slice(-3) + result; 5         num = num.slice(0, num.length - 3); 6     } 7     if (num) { 8         result = num + result;  9     }10     return result;11 }

方法三:正则表达式法

1 function toThousands(num) {2     return (num || 0).toString().replace(/(\d)(?=(?:\d{3})+$)/g, ‘$1,‘);3 }

方法四:转换格式法

1 function toThousands(num) {2     return (num || 0).toLocaleString(‘en-US‘);3 }

 

数字的千分位格式化方法