用js实现Markdown新窗口打开链接

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window.onload = function () {  
var links = document.querySelectorAll( '.custom-markdown a' );  
for (var i = 0, length = links.length; i < length; i++) {  
    if (links[i].hostname != window.location.hostname) {
        links[i].target = '_blank';
    }
}
}
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