从网址生成面包屑导航

var parts = location.pathname.split('/').filter(Boolean);
var bar = document.createElement('div');
bar.style.cssText = 'position:fixed;top:0;left:0;right:0;background:#222;color:#eee;font:13px sans-serif;padding:6px 12px;z-index:99999';
var acc = '';
var home = document.createElement('a');
home.href = '/';
home.textContent = location.host;
home.style.color = '#7fd1d8';
bar.appendChild(home);
parts.forEach(function (p) {
  acc += '/' + p;
  bar.appendChild(document.createTextNode(' › '));
  var a = document.createElement('a');
  a.href = acc;
  a.textContent = decodeURIComponent(p);
  a.style.color = '#7fd1d8';
  bar.appendChild(a);
});
document.body.appendChild(bar);
document.body.style.paddingTop = '32px';