Javascript技巧sss

1. Javascript数组转换为CSV格式

<p id="sports">basketball,badminton,jogging</p>

var sportsArr = ['basketball', 'badminton', 'jogging'];
var csv = sportsArr.valueOf();
document.getElementById('sports').innerHTML = csv;

或者

var sports = ['basketball', 'badminton', 'jogging'];
var csv = sports.join(',');

2. 将CSV格式重新转换回Javscript数组

var csv = 'basketball,badminton,jogging';
var sportsArr = csv.split(',');

3. 移除数组中的某个元素

删除数组中第二个元素
var sportsArr = ['basketball', 'badminton', 'jogging'];
sportsArr.splice(1, 1);

4. 产生1到N的随机数

var random = Math.floor(Math.random() * N + 1);

5. 去掉数组中的重复元素

function removeDuplicates(arr) {
    var tempObj = {};
    for (var i = 0; i < arr.length; i++) {
        tempObj[arr[i]] = true;
    }

    var tempArr = [];
    for (var key in tempObj) {
        tempArr.push(key);
    }
    return tempArr;
}

6. 去掉字符串前后多余的空格

if (!String.prototype.trim) {
    String.prototype.trim=function() {
       return this.replace(/^\s+|\s+$/g, '');
    };
}