var items = '<li class="details">' + 
      '<span>Hello world</span>' + 
      '</li>'; 

var items = '<li class="details">' \ 
      '<span>Hello world</span>' \ 
      '</li>'; 

var empList = ['<li class="details">', '<span>Hello world</span>','</li>'].join(""); 

function StringBuffer(){ 
  this.buffer = []; 
} 
StringBuffer.prototype = { 
  constructor: StringBuffer, 
  append: function(str){ 
    this.buffer.push(str); 
    return this; 
  }, 
  toString: function(){ 
    return this.buffer.join(''); 
  } 
}; 

$('.warning').html(` 
  <h1>Working!</h1> 
  <p>迷糊餐厅</p> 
  <p>区区一只亚麻太</p> 
`);