js，css随笔（动态生成的dom做点击事件无效）

margin: 0;
padding: 0;
border: 1px solid transparent; //自定义边框
outline: none; //消除默认点击蓝色边框效果

$("#btn").keydown(function(event){
　　　　if(event.keyCode == 13){
　　　　　　alert(‘你按下了Enter‘); 
　　　　}
});

1. $("#JS_ul").off("click").on("click","li",function(event){
                
        var val = $(this).html()
        $("#JS_ul li").removeClass("yactive");
        $(this).addClass(‘yactive‘);  
 });
 2. $("p").on("click",function(){ alert("段落被点击了。"); });

 3. $("div").on("click","p",function(){
    alert($(this).text());
 })

for (var i = 0; i <= obj.length-1; i++) {
      html += ‘<li id="JS_li">‘+
                       ‘<div class="box">‘+
                       ‘<div class="y_num">‘+obj[i].code+‘</div><div class="y_town">‘+obj[i].name+‘</div>‘+
                       ‘</div>‘+
              ‘</li>‘
}
$(‘#JS_ul‘).html(html);

var json = ‘{"result":true, "count":42}‘;
var obj = JSON.parse(json);

var foo = {foundation: "Mozilla", model: "box", week: 45, transport: "car", month: 7};
var jsonString = JSON.stringify(foo, replacer);