版权声明:本文为博主汪子熙原创文章,未经博主允许不得转载。 https://cloud.tencent.com/developer/article/1439759
先看下需求。
我想把这很长一大段的带有markdown格式的字符串里包含的image标签的文件名和url解析出来,连同文件名中包含的序号,一起存储到一个数组中。
var input = “
” + “\n” +
“
” + “\n” +
“
”;
然后对这个数组根据序号进行排序,比如上图的image标签顺序是image3, image1和image2,但我希望排序后的顺序是image1, image2和image3.
下面是我的代码。
<html>
<script>
var input = "![image3.png](https://upload-images.jianshu.io/upload_images/2085791-4d8b2cda3a057fb6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)" + "\n" +
"![image1.png](https://upload-images.jianshu.io/upload_images/2085791-9aa6232b1426df28.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)" + "\n" +
"![image2.png](https://upload-images.jianshu.io/upload_images/2085791-04f2773c126194fe.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)";
var IMAGE_PATTERN = /^!\[(.*)\]\((.*)\)$/;
var IMAGE_INDEX = /^image(\d+).*$/;
function MyImage(index, name, url){
this.index = index;
this.name = name;
this.url = url;
}
var imagePool = [];
function sortByIndex(v1,v2){
if(v1.index < v2.index ){
return -1;
}
else if(v1.index > v2.index ){
return 1;
}
else return 0;
}
function getParsedImage(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 new MyImage(imageIndex[1], result[1], result[2]);
}
var raw = input.split("\n");
for( var i = 0; i < raw.length; i++){
var each = getParsedImage(raw[i]);
if( !!each){
imagePool.push(each);
}
}
imagePool.sort(sortByIndex);
debugger;
</script>
</html>
第58行传入数组原生的sort方法的参数是一个排序函数:
执行完之后,就按照我期望的MyImage对象里index属性进行排序了: