SOURCE

console 命令行工具 X clear

                    
>
console
$(document).ready(function(){
    $('#toggle').click(function(){
        $('.left').animate({width:'toggle'},350);
    });
});
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>toggle-jquery1.9</title>
</head>
<body>
    <div class="container">
        <div class="left"></div>
    </div>
    <button id="toggle">toggle</button>
</body>
</html>
div.container {
    height: 320px;
    border: 1px solid #ccc;
}
div.left {
    width: 200px;
    height: 300px;
    background-color: #36f;
}

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