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How to implement simple search and replace in javascript_javascript skills

WBOY
Release: 2016-05-16 15:49:23
Original
1591 people have browsed it

The example in this article describes how to implement simple search and replace using JavaScript. Share it with everyone for your reference. The specific implementation method is as follows:

<html>
<head>
<title>中国风</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<script language="JavaScript">
var oldStr;
var newStr;
function searchText(str){
  // 创建TextRange对象,指定为整个body区域
  var myText = document.body.createTextRange();
  if(myText.findText(str)){
    myText.select();
    // 如果找到目标文本,则将其选中
  }else{
    alert("没有找到匹配的字符!");
  }
}
function getTheText(){
  oldStr = prompt("输入要查找的内容","");
  // 获取用户要查找的内容
  if(oldStr!=null){
  // 如果内容不为空,则执行查找
    searchText(oldStr);
  }
}
function replaceText(){
  if(oldStr==null){
    alert("请先进行查找要替换的内容!");
  }else{
    newStr = prompt("替换为","");
    if(newStr!=null){
    // 新文本内容不为空,则替换选中的文本
      var selectText = document.selection.createRange();
      // 选中的文本
      selectText.text = newStr;
      // 替换选中的文本为新文本
    }else{
      alert("请输入替换的内容!");
    }
  }
}
</script>
<body>
<input type="button" value="查找" onclick="getTheText()">
<input type="button" value="替换" onclick="replaceText()">
<pre id="pre">
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I hope this article will be helpful to everyone’s JavaScript programming design.

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