需求：开发一个JavaScript函数，输入为markdown格式语法的图片标签：
输出是三个返回值：
image31.png
31
下面是我写的JavaScript函数和测试代码：
<html> <script> var input = ""; var IMAGE_PATTERN = /^!\[(.*)\]\((.*)\)$/; var IMAGE_INDEX = /^image(\d+).*$/; // var IMAGE_TAG = "[图片]"; function SortedImage(index, url){ this.index = index; this.url = url; } function sortByIndex(v1,v2){ if(v1.index < v2.index ){ return -1; } else if(v1.index > v2.index ){ return 1; } else return 0; } function run(input) { if (input.indexOf("https://upload-images.jianshu.io") < 0 ) { return; } var result = IMAGE_PATTERN.exec(input); if( result.length != 3){ return; } var imageIndex = IMAGE_INDEX.exec(result[1]); console.assert(imageIndex.length === 2); return { "fileIndex": imageIndex[1], "fileName": result[1], "fileURL": result[2], }; } var result = run(input); debugger; </script> </html>
