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js实现根据文本下标位置添加特殊标识

Posted on 2018-09-27 10:26  人生梦想起飞  阅读(452)  评论(0编辑  收藏  举报
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <title>live_exam</title>
    </head>
    <body>
       <!-- <div>
           <div style="float: left;width: 200px;margin-top: 20px; height: 100px; background: red"></div>
           <div style="display: block;overflow: hidden; height: 400px; background: blue; margin-top: 50px"></div>
       </div> -->
       <div id="testId"></div>
    </body>
    <!-- <script src="./css/channel.js"></script> -->
</html>
<script type="text/javascript">
    window.onload = function(){
        var str = 'abcdefghijklmnhjkobnvcxz'
        var arr = [[2,4],[6,8],[9,11],[20,21]]
        var result = '';
        for (var i=0; i <= arr.length-1; i++) {
            console.log(arr.length-1,i)
            if (arr.length > 1) {
                if (i == 0) {
                   // console.log(1)
                    result += str.substring(0,arr[i][0]) + '<span style="color:red">' + str.substring(arr[i][0],arr[i][1] + 1) + '</span>'
                    //console.log(result)
                } else if (i >0 && i< arr.length-1) {
                    //console.log(2)
                    result += str.substring(arr[i-1][1] + 1,arr[i][0]) + '<span style="color:red">' + str.substring(arr[i][0],arr[i][1] +1) + '</span>'
                    //console.log(result)
                } else if (i == arr.length-1) {
                    //console.log(result)
                    //console.log(4)
                    result += str.substring(arr[i-1][1] + 1,arr[i][0]) + '<span style="color:red">' +str.substring(arr[i][0],arr[i][1] + 1) + '</span>' + str.substring(arr[i][1]+ 1)
                }
            } else {
                result += str.substring(0,arr[i][0]) + '<span style="color:red">' + str.substring(arr[i][0],arr[i][1] + 1) + '</span>' + str.substring(arr[i][1]+ 1)
            }
            
        }
        document.getElementById('testId').innerHTML = result
        //console.log(result)
    }
    var text = 'ad$$1a$$nihao$$67$$nihao$$'
        var reg = /\$\$.*?\$\$/ig;
        var arr = []
        //var reg10 = /http(s)?:/ig;
        //var  str2 = text.replace(reg,'')
        var str2 = text.replace(reg,function(exp){
            console.log('-----------')
            console.log(exp)
            arr.push(exp)
            //console.log(exp.replace(reg10,''))
            //return exp.replace(reg10,'');
        })
 
        console.log(arr)
</script>