• 文本内容自动回滚 【js读书笔记】


     1 <!DOCTYPE html>
     2 <html>
     3     <head>
     4         <meta charset="UTF-8">
     5         <title>文本内容自动回滚</title>
     6     </head>
     7     
     8     <body>
     9         <h2>文本框中的文字自动回滚效果</h2>
    10         <div id="rollContent" data-rwidth="100" data-rheight="100" class="roll_content">
    11             aaaaaaaaaaa
    12             bbbbbbbbbbb
    13             ccccccccccc
    14             ddddddddddd
    15             eeeeeeeeeee
    16             fffffffffff
    17             ggggggggggg
    18             rrrrrrrrrrr
    19             ttttttttttt
    20             wwwwwwwwwww
    21         </div>
    22         <script type="text/javascript">
    23             window.onload=function(){
    24                 var _rollContent=document.getElementById("rollContent"),
    25                     _div=_rollContent.innerHTML;
    26                     
    27                 var setCss=function(_this,cssOption){//设置样式
    28                         //检测节点类型
    29                         if(!_this||_this.nodeType===3||_this.nodeType===8||!_this.style){
    30                                 return console.log("bug");
    31                         }
    32                         for(var cs in cssOption){//遍历样式
    33                             _this.style[cs]=cssOption[cs];
    34                         }
    35                         return _this;
    36                         
    37                     };
    38                     
    39                 _rollContent.innerHTML="<div id='rollContent_roll'>"+_div+"</div>";
    40                 
    41                 setCss(_rollContent,{
    42                     "position":"relative",
    43                     "overflow":"hidden",
    44                     "wordWrap":"break-word",
    45                     "wordBreak":"break-all",
    46                     "width":_rollContent.getAttribute("data-rwidth")+"px",
    47                     "height":_rollContent.getAttribute("data-rheight")+"px",
    48                     "border":"2px solid red"
    49                 });
    50                 
    51                 var _timeRoll=document.getElementById("rollContent_roll");
    52                 var _h=_timeRoll.offsetHeight;
    53                 
    54                 timeoutRoll=function(){//修改top值
    55                     var _h=_timeRoll.offsetHeight,
    56                         _t=parseInt(_timeRoll.style.top,10);
    57                         //是否将top设置为0
    58                     var _tt=_h>Math.abs(_t)||_t>=0?_t-10:(_h||0);
    59                     setCss(_timeRoll,{
    60                         "top":_tt+"px",
    61                         "border":"1px solid blue"
    62                     });
    63                     setTimeout(timeoutRoll,200);//设置定时器
    64                 };
    65                 //判断滚动高度是否大于data-rheight
    66                 if(_h>_rollContent.getAttribute("data-rheight")){
    67                     timeoutRoll();
    68                     setCss(_timeRoll,{
    69                         "position":"relative",
    70                         "top":"0px"
    71                     });
    72                 }
    73                 
    74             };
    75         </script>
    76     </body>
    77 </html>
    “想要越幸运,就要越努力”
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  • 原文地址:https://www.cnblogs.com/HollyLearning/p/5439678.html
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