作为一个JavaScript断点。evalthis使用JavaScript的“（）”函数的任何上下文中执行用户指定的JavaScript是目前在哪里设置断点。

Used as a javascript breakpoint. evalThis uses javascripts "eval()" function to execute user specified javascript via a javascript Prompt(). This user code will execute with whatever context was presetn at the time it was called, hence the breakpoint like effect. Upon complete of the user script, the prompt will display the results if any, and re-populate the prompt with the last script executed. This will continue until the user clicks cancel. evalThis is usually called with NO parameters. All of the parameters are intended for the script to use recursively, except sPrompt, which doesn"t change.