Question

紧急求助，lastIndexOf为什么在IE8下不识别

视频效果的JS在IE9里一直报错：无法获取未定义或 null 引用的属性“lastIndexOf”

请问怎么解决

Answer 1

if (!Array.prototype.indexOf){
Array.prototype.indexOf = function(elt /*, from*/){
var len = this.length >>> 0;
var from = Number(arguments[1]) || 0;
from = (from < 0)
? Math.ceil(from)
: Math.floor(from);
if (from < 0)
from += len;
for (; from < len; from++)
{
if (from in this &&
this[from] === elt)
return from;
}
return -1;
};
}
http://blog.csdn.net/xb12369/article/details/20922301你可以看看

追问

我在js中加了这段代码，还是不好用，醉了 /哭/哭/哭

追答

呃呃呃

追问

不过十分感谢