Javascript或JQuery如何替换字符串中的所有“ +”

Question

Right now I have a variable which is storing a string.

var value = "66+88";

How can I replace '+' with a standard + operator so that I can evaluate

66 + 88 = 154

Thanks

Answer 1

Use String#split , Array#map it to get Number and then Array#reduce

 var value = "66+88"; var result = value.split('+').map(Number).reduce(function(a, b) { return a + b; }, 0); console.log(result); 

Answer 2

You can use eval for this:

var value = eval("66+88");

But you need to be careful, especially if this string come's from user.

This function will evaluate input string as JavaScript and can damage your other scripts or can be used for hacker attacks.

Use it at your own risk!

Answer 3

Use String#replace

 var value = "66+88"; var result = value.replace(/^(\\d+)\\+(\\d+)$/, function(x, y, z){ return parseInt(y) + parseInt(z) }) console.log(result); 

Answer 4

You can use split() method to split the string.

var value = "66+88";
var no = value.split('+');
console.log(parseInt(no[0]) + parseInt(no[1]));

split() method will return an array . In this case

no = ['66','88']

parseInt() will convert string to Int and you can calculate the sum.

Thanks!

Answer 5

You could use split and reduce to sum up your string.

Here is an example.

 var value1 = "66+88"; var value2 = "66+88+44"; function sumUpStr (strToSum) { var sum = strToSum.split("+").reduce(function(prev, next) { return +prev + +next; }); return sum; }; console.log("Sum of value1 is: " + sumUpStr(value1)); console.log("Sum of value2 is: " + sumUpStr(value2)); console.log("Sum of value1 + value2 is: " + sumUpStr(value1 + "+" + value2));