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JavaScript trim 实现(去除字符串首尾指定字符)


String.prototype.trim = function (char, type) {
    if (char) {
        if (type == 'left') {
            return this.replace(new RegExp('^\\'+char+'+', 'g'), '');
        } else if (type == 'right') {
            return this.replace(new RegExp('\\'+char+'+$', 'g'), '');
        }
        return this.replace(new RegExp('^\\'+char+'+|\\'+char+'+$', 'g'), '');
    }
    return this.replace(/^\s+|\s+$/g, '');
};


// 去除字符串首尾的全部空白
var str = ' Ruchee ';
console.log('xxx' + str.trim() + 'xxx');  // xxxRucheexxx


// 去除字符串左侧空白
str = ' Ruchee ';
console.log('xxx' + str.trim(' ', 'left') + 'xxx');  // xxxRuchee xxx


// 去除字符串右侧空白
str = ' Ruchee ';
console.log('xxx' + str.trim(' ', 'right') + 'xxx');  // xxx Rucheexxx


// 去除字符串两侧指定字符
str = '/Ruchee/';
console.log(str.trim('/'));  // Ruchee


// 去除字符串左侧指定字符
str = '/Ruchee/';
console.log(str.trim('/', 'left'));  // Ruchee/


// 去除字符串右侧指定字符
str = '/Ruchee/';
console.log(str.trim('/', 'right'));  // /Ruchee

date:2014-12-22