uncaught语法错误意外令牌= in chrome for bigpipe.js [关闭]

I am using bigpipe.js method to my website for displaying newsfeed.It is working fine in all the browsers except google chrome.In chrome its showing 'uncaught syntaxerror unexpected token = ' error.Please help me to rectify this error.

do it like that

function photoPopUp(aid,im_type,im_cat){
    if (typeof(im_cat) === undefined) im_cat = 0
    // your code here
}