JS实现文本中查找并替换字符
效果图：
代码如下，复制即可使用：
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
*{font-family:"微软雅黑";font-size:16px;margin:0;padding:0;letter-spacing:3px;line-height:22px;}
#wrap{width:500px;height:300px;margin:20px auto;position:relative;}
#text{width:500px;height:300px;border:1px solid green;}
#result{width:500px;position:absolute;left:0px;top:0px;display:none;}
input{width:100px;height:40px;margin-top:5px;}
span{background-color:yellow;}
</style>
</head>
<body>
<div id="wrap">
<div id="result"></div>
<textarea id="text" placeholder="请在此输入文本。。。。"></textarea>
<input type="text" id="val" placeholder="被查找字符"/>——<input type="text" id="new_val" placeholder="替换后字符"/>
<input type="button" id="btnFind" value="替换"/> <input type="button" value="重置" id="reset"/>
</div>
<script type="text/javascript"> function replace(){
var inner=null;
var txt=document.getElementById('text').value.toString();
var val=document.getElementById('val').value.toString();
var newVal=document.getElementById('new_val').value.toString();
newInner="<span>"+newVal+"</span>";
for(var i=0;i<=txt.length-val.length;i++){
if(txt==""||val=="") {
alert("请输入内容！");
return false;
}
if(txt.length<val.length) {
return false;
}
if(i+val.length>=txt.length){
if(txt.substring(i)==val){
inner=txt.split('');
inner.splice(i,val.length,newInner);
txt=inner.join("");
i=i+newInner.length-1;
} }
else {
if(txt.substring(i,i+val.length)==val) {
inner=txt.split('');
inner.splice(i,val.length,newInner);
txt=inner.join("");
i=i+newInner.length-1;
}
}
}
document.getElementById("result").innerHTML=txt;
document.getElementById("text").value=null;
document.getElementById("text").placeholder="";
document.getElementById("result").style.display="block";
} document.getElementById('btnFind').onclick=function(){
replace();
}
document.getElementById('reset').onclick=function(){
document.getElementById("result").style.display="none";
document.getElementById("val").value=null;
document.getElementById("new_val").value=null;
document.getElementById("text").placeholder="请在此输入文本。。。。"; } </script>
</div>
</body>
</html>
如有错误，欢迎联系我改正，非常感谢！！！