Javascript / Jquery - 从字符串中获取数字
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Javascript / Jquery - Get number from string
提问by Alex
the string looks like this
字符串看起来像这样
"blabla blabla-5 amount-10 blabla direction-left"
How can I get the number just after "amount-", and the text just after "direction-"?
我怎样才能得到紧随其后的数字和紧随其后"amount-"的文本"direction-"？
回答by Ed.C
This will get all the numbers separated by coma:
这将得到所有由昏迷分隔的数字：
var str = "10 is smaller than 11 but greater then 9"; var pattern = /[0-9]+/g; var matches = str.match(pattern);
After execution, the string matcheswill have values "10,11,9"
执行后，字符串matches将有值"10,11,9"
If You are just looking for thew first occurrence, the pattern will be /[0-9]+/- which will return 10
如果您只是在寻找第一次出现，则模式将是/[0-9]+/- 它将返回10
(There is no need for JQuery)
（不需要JQuery）
回答by PleaseStand
This uses regular expressionsand the exec method:
var s = "blabla blabla-5 amount-10 blabla direction-left";
var amount = parseInt(/amount-(\d+)/.exec(s)[1], 10);
var direction = /direction-([^\s]+)/.exec(s)[1];
The code will cause an error if the amount or direction is missing; if this is possible, check if the result of exec is non-null before indexing into the array that should be returned.
如果缺少金额或方向，代码将导致错误；如果可能，请在索引到应返回的数组之前检查 exec 的结果是否为非空。
回答by Aif
You can use regexp as explained by w3schools. Hint:
您可以按照w3schools 的说明使用正则表达式。暗示：
str = "blabla blabla-5 amount-10 blabla direction-left"
alert(str.match(/amount-([0-9]+)/));
Otherwize you can simply want all numbers so use the pattern [0-9]+ only. str.match would return an array.
否则，您可以简单地想要所有数字，因此仅使用 [0-9]+ 模式。str.match 将返回一个数组。
