javascript随机读取数组

JavaScript随机从数组读取一项数据

function write_quote() {
 
    var quotes = [
        'no animals were harmed while making this page',
        'made in ulm',
        'this page was handmade',
        'Get <a href="http://www.mozilla.org/products/firefox/">FireFox</a> :-)'
    ];
 
    var r = Math.round(Math.random() * (quotes.length-1));
 
    // write the quote
    document.write(quotes[r]);
 
    // or replace an HTML element:
    // document.getElementById("quote").innerHTML = quotes[r];
 
}