JavaScript字符串技巧

String.prototype.strReverse = function() {
    return this.split(‘‘).reverse().join(‘‘);
}
function amountSplit(amount) {
    return amount.toString().strReverse().replace( /(\d+\.)?(\d{1,3})/g, ‘$1$2,‘ ).strReverse().substring( 1 );
}
console.log( amountSplit( 120000.12 ) ); // 120,000.12
console.log( amountSplit( 1285000) ); // 1,285,000

Math.round(num1 / num2 * 10000) / 100.00 + ‘%‘