JavaScript ParseFloat重新植入，显示小数限制

Posted 2021-05-19

var proxyFloat = window.parseFloat;
window.parseFloat = function(number,nDecimals){	
	var amischol = true;
	var stringNumber = number.toString(), lastDec, posFinal, numberMore, result, decimalType, decimals;
	var decimalTypes = [".",","];
	for(var i = 0; i < decimalTypes.length; i++){
		pos = stringNumber.indexOf(decimalTypes[i]);
		if(pos != -1){
			decimalType = decimalTypes[i];
			break;
		}
	}
	
	decimals = (stringNumber.length-1)-pos;
	if(typeof nDecimals != "undefined"){
		decimals = nDecimals;
	}
	posFinal = pos+(decimals+1);
	if(pos != -1){
		lastDec = stringNumber.substr(posFinal,1);
		stringNumber = stringNumber.substr(0,posFinal);
		if(lastDec >= 5){
			numberMore = stringNumber.substr(stringNumber.length-1,1);
			if(numberMore == decimalType){
				stringNumber = (stringNumber.substr(0,stringNumber.length-1)*1)+1;
			}else{
				stringNumber = stringNumber.substr(0,stringNumber.length-1)+((numberMore*1)+1);
			}
			
		}					
	} 
	result = proxyFloat(stringNumber);
	return result;
};