javascript - 如何使用 JS 选择 Picture_1.png 之前的所有内容？

Question

我试图弄清楚如何使用 JS 选择此网址中 Picture_1.png 之前的所有内容:

"http://s3.amazonaws.com/hq-photo/development/system/photos/215/cropped_thumb/Picture_1.png"

最终结果是这样的:

"http://s3.amazonaws.com/hq-photo/development/system/photos/215/cropped_thumb"

Answer 1

var str = "http://s3.amazonaws.com/hq-photo/development/system/photos/215/cropped_thumb/Picture_1.png";
var trimmed = str.substr(0, str.lastIndexOf("/"));

演示:http://jsfiddle.net/gAxPx/