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array.splice() in Internet Explorer
I finally got around to investigating an IE bug I’ve been meaning to look into. The root cause was a difference between JScript and ECMAScript as regards array.splice(). The signature for this handy method that removes and inserts array elements in place:

splice(start, deleteCount, value, ...)

According to the standard, only start (the index at which to start removing elements) is a required argument. So:

var a = ["e1", "e2", "e3"];
a.splice(1);

should result in a being a single-element array containing “e1″. But of course, IE does not see it that way. According to MSDN, deleteCount is also required argument. Thus, the above would have to be:

var a = ["e1", "e2", "e3"];
a.splice(1, a.length-1);

问题：

使用 markdown.js 在 IE 下无法正常显示 pre 代码

原因：

array.splice() 在 IE 下的 bug 引起的

解决：

将 markdown.js 中的第 1495 行：

1

code.push.apply( code, jsonml.splice( i ) );

改为

1

code.push.apply( code, jsonml.splice( i, jsonml.length - 1) );