前端ABC<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>筛选出现次数最多的字符</title>
<style type="text/css">
.wrap{width:500px;height:300px;margin:0 auto;}
textarea{color:green;font-family: "微软雅黑";font-size: 16px;display: block;margin: auto;width:500px;height:300px;}
button{display:block;width:100px;height:45px;}
#val{width:100%;color:#008000;font-family: "微软雅黑";font-size: 20px;font-weight: bold;};
</style>
</head>
<body>
<div class="wrap">
<textarea rows="20" cols="90" id="txt"></textarea>
<button id="btn">提取</button><br/><br/><br/>
<div id="val">
</div>
</div>
<script type="text/javascript">
var btn=document.getElementById("btn");
function extract()
{
var str=document.getElementById("txt").value;
if(str=="")
{
alert("请输入内容!");
return false;
}
str=str.toString();
var obj={},max=new Array();
for(var i=0;i<str.length;i++)
{
if(obj[str[i]])
{
obj[str[i]]++;
if(obj[str[i]]>obj[max[0]])
{
max.splice(0,max.length,str[i]);
}
else
{
if(obj[str[i]]==obj[max[0]]&&str[i]!=max[0])
{
max.push(str[i]);
}
else if(obj[str[i]]==obj[max[0]]&&str[i]==max[0])
{
max.splice(0,max.length,str[i]);
}
}
}
else
{
obj[str[i]]=1;
if(i==0)
{
max[0]=str[i];
}
else
{
if(obj[str[i]]==obj[max[0]]&&str[i]!=max[0])
{
max.push(str[i]);
}
else if(obj[str[i]]==obj[max[0]]&&str[i]==max[0])
{
max.splice(0,max.length,str[i]);
}
}
}
}
document.getElementById("val").innerHTML="出现次数最多的字符为："+max+"<br/><br/>"+"出现的次数为："+obj[max[0]];
}
btn.onclick=function()
{
extract();
}
</script>
</body>
</html>
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