jQuery动画与特效详解(4)

<style>
            div {
                background-color: #FFFF00;
                height: 40px;
                width: 80px;
                border: 1px solid #000000;
                margin-top: 5px;
                padding: 5px;
                text-align: center;
                position: absolute;
            }
        </style>
        <script type="text/javascript">
            $(function() {
                $("button:first").click(function() {
                    $("#block").animate({
                        left: "-=80px" //相对左移
                    }, 300);
                });
                $("button:last").click(function() {
                    $("#block").animate({
                        left: "+=80px" //相对右移
                    }, 300);
                });
            });
        </script>
        <button >Go>></button>
        <button >Go>></button>
        <div>动画！</div>

先将div进行绝对定位，然后使用animate()中的-=和+=分别实现相对左移和相对右移。

animate()方法还有另外一种形式，如下所示：

animate(params,options)
其中，params与第一种形式完全相同，options为动画可选参数列表，主要包括duration,esaing，callback,queue等，其中duration.easing.callback与第一种形式完全一样，queue为布尔值，表示当有多个 animate()组成jQuery时，当前animate()紧接这下一个animate(),是按顺序执行(true)还是同时触发false

如下例子，展示了animate()第二种用法。

复制代码 代码如下:

    <style>
            div {
                background-color: #FFFF22;
                width: 100px;
                text-align: center;
                border: 2px solid #000000;
                margin: 3px;
                font-size: 13px;
                font-family: Arial, Helvetica, sans-serif;
            }
            input {
                border: 1px solid #000033;
            }
        </style>
        <script type="text/javascript">
            $(function() {
                $("input:eq(0)").click(function() {
                    //第一个animate与第二个animate同时执行，然后再执行第三个
                    $("#block1").animate({
                            width: "90%"
                        }, {
                            queue: false,
                            duration: 1500
                        })
                        .animate({
                            fontSize: "24px"
                        }, 1000)
                        .animate({
                            borderRightWidth: "20px"
                        }, 1000);
                });
                $("input:eq(1)").click(function() {
                    //依次执行三个animate
                    $("#block2").animate({
                            width: "90%"
                        }, 1500)
                        .animate({
                            fontSize: "24px"
                        }, 1000)
                        .animate({
                            borderRightWidth: "20px"
                        }, 1000);
                });
                $("input:eq(2)").click(function() {
                    $("input:eq(0)").click();
                    $("input:eq(1)").click();
                });
                $("input:eq(3)").click(function() {
                    //恢复默认设置
                    $("div").css({
                        width: "",
                        fontSize: "",
                        borderWidth: ""
                    });
                });
            });
        </script>
        <input type="button" value="Block1动画">
        <input type="button" value="Block2动画">
        <input type="button" value="同时动画">
        <input type="button" value="重置">
        <div>Block1</div>
        <div>Block2</div>