那么一（尽可能的差异去）是评估返回的前$ P结果$ pssion。

Well one (as far as differences go) is eval will return the result of an expression.

var result = eval('3+4'); // result = 7 

只要你的JavaScript字符串在脚本块的结构，我想提出一个脚本标签中注入它/

As long as your javascript string is in the structure of a script block, i would suggest injecting it within a script tag/