字符串拼接的两种方法

1.普通的拼接：

        var htmlSpan = "";
          for (var j = 0; j < len - 1; j++) {
              htmlSpan += '<span>我是拼接生成的字符串</span>';
          }
          htmlSpan += '<span class="on">·</span>';
          $(".dots").html(htmlSpan);

2.使用数组的方法：

  var data = [
        {id:'1'},
        {id:'2'},
        {id:'3'},
        {id:'4'},
    ]
    test(data)
    function test(msgArr) {
        var len = msgArr.length;
        var n = 0 ;
        var imgs = [];
        var img = [];
        img[0] = '<a href="' + 222 + '/webservice/dish/detail?id=';
        img[1] = '#';
        img[2] = '"><img src="';
        img[3] = '#';
        img[4] = '"></a>';
        for (var i = 0; i < len; i++) {
            img[1] = msgArr[i].id;
            img[3] = msgArr[i].pic;
            imgs.push(img.join(""));
        }
        $("#banner_list").html(imgs.join(""));
    }