angular过滤器 -- 截取字符串

使用angular定义用于截取特定长度的过滤器，并使用自定义符号（包括“...”）在末尾进行替换

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>stringSub</title>
</head>
<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
<body ng-app="myApp" ng-controller="myController">
<span style="background: #ddd;border-radius: 4px;padding:2px;">{{arr | cutTxt:55:"..."}}</span>
</body>
<script>
    var app = angular.module('myApp', []);
    app.controller('myController', function($scope) {
        $scope.arr="这是一个技术更新迅猛的年代！";
    });

    app.filter('cutTxt', function () {
        return function (value, max,tail) {
            var judgeLength = 0,cutString = new String();
            var re = /^[\u4E00-\u9FA5]$/;
            if (!value){
                return ''
            };
            max = parseInt(max);
            for (var i = 0; i < value.length; i++) {
                if (judgeLength >= max) {
                    cutString = cutString.substr(0, cutString.length-1);
                    cutString = cutString.concat(tail||"..");
                    return cutString;
                }

                var singleChar = value.charAt(i);
                if (re.test(singleChar)) {
                    judgeLength+=2;
                    console.log(singleChar);
                }
                else{
                    judgeLength++;
                }
                cutString = cutString.concat(singleChar);
            }
            return cutString;
        };
    });
</script>
</html>

未限制长度时：

限制长度时：

 

//***********      添加另一个方法    *********//

app.filter("formatStrFilter",function(){
        return function setString(str, len) {
            if(str==null){
                return "";
            }
            var strlen = 0;
            var s = "";
            for (var i = 0; i < str.length; i++) {
                if (str.charCodeAt(i) > 128) {
                    strlen += 2;
                } else {
                    strlen++;
                }
                s += str.charAt(i);
                if (strlen >= len) {
                    return s+"...";
                }
            }
            return s;
        }
    })

 

posted @ 2017-09-26 19:01  十盏  阅读(3053)  评论(0)  编辑  收藏  举报