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Javascript regex and parse Int
原标题:Javascript regex and parseInt

我有一份 Java文reg,在座标上打上相应的编号,我可以乘以。

 foo1 bar2.7 .replace(/(d+.?d*)/g, parseInt( $1 , 10) * 2);

我愿回到<条码>foo2 条码5,但返回<条码>。

我在这里做了什么错误?

最佳回答

<代码>parseInt( 1 , 10) * 2首先执行,其result通过replace。 您希望利用反馈功能:

 foo1 bar2.7 .replace(/(d+.?d*)/g, function(match, number) {
    return +number * 2;
});

Furthermore, parseInt will round down any floating point value, so the result would be "foo2 bar4". Instead you can use the unary plus operator to convert any numerical string into a number.

问题回答

页: 1

Instead, you can pass a function to replace like so:

 foo1 bar2.7 .replace(/(d+.?d*)/g, function (str) {
    return parseInt(str, 10) * 2;
});

https://developer.mozilla.org/en/Javagust/Reference/Global_Objects/String/replace#Specification_a_Function_as_a_paraile”rel=“nofollow”>MDC article , 内容是作为参数通过String.replace<>

请注意,如果你有一个以上组别,你可以做如下事情:

"p-622-5350".replace(/p-(d+)-(d+)/, function (match, g1, g2) { 
    return "p-" + (+g1 * 10) + "-" + (+g2 *10); 
});

(单位:千美元)





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