JS字符串拼接换行

var str = "<h1 class='h1'>"+hello+"</h1>\
            <ol>\
                <li>a</li>\
                <li>b</li>\
            </ol>"

var str ="<h2>hello</h2>"
         +"<li>world</li>";

es6

var str =  `<h1 class="h1">${hello}</h1>
            <ol>
                <li>a</li>
                <li>b</li>
            </ol>`