8款Javascr ipt实现的进度条，都有使用样例，代码实现精简，使用简单，类弄多样，有面页自动加载触发，有提交表单按钮事件触发。外观美观，值的参考！~-8 Javascr ipt implementation progress bar has to use the sample code to achieve streamlined, simple to use, Lane diverse class, face page loaded automatically trigger the submit form button event trigger. Attractive appearance, the reference value! ~