javascript 如何从变量中删除所有非数字字符
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How to remove all non-numeric characters from a variable
提问by Haren Sarma
How can I remove all text characters (not numbers or float) from a javascript variable ?
如何从 javascript 变量中删除所有文本字符（不是数字或浮点数）？
function deduct(){
var getamt= document.getElementById('cf').value; //eg: "Amount is 1000"
var value1 = 100;
var getamt2 = (value1-getamt);
document.getElementById('rf').value=getamt2;
}
I want getamtas number. parseIntis giving NaNresult.
我要getamt号码。parseInt正在给出NaN结果。
采纳答案by Johny
Use regular expression like this:
像这样使用正则表达式：
var getamt= document.getElementById('cf').value; //eg: Amount is 1000
var value1 = 100;
var getamt2 = value1 - getamt.replace( /\D+/g, ''); // this replaces all non-number characters in the string with nothing.
console.log(getamt2);
回答by epascarello
You can replace the non-numbers
您可以替换非数字
var str = "Amount is 1000";
var num = +str.replace(/[^0-9.]/g,"");
console.log(num);or you can match the number
或者你可以匹配号码
var str = "Amount is 1000";
var match = str.match(/([0-9.])+/,"");
var num = match ? +match[0] : 0;
console.log(num);The match could be more specific too
比赛也可以更具体
