Jquery g、 功能（m）{ 返回m.toUpperCase（）； }); }); a:：before{ 内容：attr（title）； }

这不能在CSS中完成，因为CSS只改变HTML的表示，而不改变底层数据或属性。因此，JavaScript是这种情况下的唯一解决方案。为此，我建议：

// retrieving all elements with a title-attribute, using
// document.querySelectorAll(), and converting that into an Array
// using Array.from.
// we then use Array.prototype.forEach() to iterate over each of
// those nodes:
Array.from(document.querySelectorAll('[title]')).forEach(function(el) {
  // 'el' (the first argument) is the current Array-element of the
  // Array over which we're iterating.

  // here we use String.prototype.replace() to replace a the
  // captured string `[a-z]` (lower-case only) which follows a
  // a word-boundary (`\b`) finding all matches (g) from the supplied
  // string, and using the anonymous function of the replace() method:
  return el.title = el.title.replace(/\b([a-z])/g, function(m){

    // here we return the match ('m') once we've converted it
    // to uppercase using String.prototype.toUpperCase():
    return m.toUpperCase();
  });
});

Array.from（document.querySelectorAll（'[title]'））.forEach（函数（el）{
返回el.title=el.title.replace（/\b（[a-z]）/g，函数（m）{
返回m.toUpperCase（）；
});
});
a:：before{
内容：attr（title）；
}
非常酷的更换解决方案！只是用
querySelector
而不是
queryselectoral
：）打错了，我在验证阶段就发现了。非常酷的替换解决方案！只是输入了
querySelector
而不是
queryselectoral
：）是的，我在验证阶段发现了这一点。
<a href="#" title="This Is Title Capitalize">

var elems = document.getElementsByTagName('a');

for (el in elems) {
    if (el.hasAttribute('title') {
        var str = el.getAttribute('title');
        str = titleCase(str);
        el.setAttribute('title', str);
    }
}

function titleCase(str) {  
  str = str.toLowerCase().split(' ');

  for(var i = 0; i < str.length; i++){
    str[i] = str[i].split('');
    str[i][0] = str[i][0].toUpperCase(); 
    str[i] = str[i].join('');
  }
  return str.join(' ');
}

<script>
(function() {
  [].forEach.call(document.querySelectorAll('[title]'), function(element) {
    var words = element.title.split(/\s+/);
    var capitalized = words.map(function(word) {
      return word[ 0 ].toUpperCase() + word.slice(1);
    });
    element.title = capitalized.join(' ');
  });
})();
</script>

// retrieving all elements with a title-attribute, using
// document.querySelectorAll(), and converting that into an Array
// using Array.from.
// we then use Array.prototype.forEach() to iterate over each of
// those nodes:
Array.from(document.querySelectorAll('[title]')).forEach(function(el) {
  // 'el' (the first argument) is the current Array-element of the
  // Array over which we're iterating.

  // here we use String.prototype.replace() to replace a the
  // captured string `[a-z]` (lower-case only) which follows a
  // a word-boundary (`\b`) finding all matches (g) from the supplied
  // string, and using the anonymous function of the replace() method:
  return el.title = el.title.replace(/\b([a-z])/g, function(m){

    // here we return the match ('m') once we've converted it
    // to uppercase using String.prototype.toUpperCase():
    return m.toUpperCase();
  });
});