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麻煩幫我糾下錯(cuò)，不知道錯(cuò)在哪里

<!DOCTYPE?HTML>
<html>
<head>
????<meta?http-equiv="Content-Type"?content="text/html;?charset=gb18030">
????<title>Untitled?Document</title>
????
</head>
<body>
????<script?type="text/javascript">???
????????/*
?????????*?param1?Array?
?????????*?param2?Array
?????????*?return?true?or?false
?????????*/
????????function?arraysSimilar(arr1,?arr2){
????????????var?arr1_type=new?Array();
????????????var?arr2_type=new?Array();
????????????if(arr1.length=arr2.length){
????????????????for(var?i=0;i<arr1.length;i++){
???????????????????arr1_type[i]=gettype(arr1[i])
???????????????????arr2_type[i]=gettype(arr2[i]);
????????????????}
????????????}
????????????arr1_type.sort();
????????????arr2_type.sort();
????????????type1=arr1_type.join();
????????????type2=arr2_type.join();
????????????if(type1==type2){
????????????????return?true;
????????????}else{
????????????????return?false;
????????????}
????????}
????????function?gettype(item){
????????????var?Type=typeof?item
????????????if(Type=object){
????????????????return?Type;
????????????}else?if(item?instanceof?Date){
????????????????Type="Date"
????????????}else?if(item===window){
????????????????Type="window";
????????????}else?if(item===null){
????????????????Tyep="null"
????????????}else?if(item?instanceof?Array){
???????????????Type="Array"
????????????}else?{
???????????????Type="obejct"
????????????}
????????????return?Type;
????????}
????</script>
????<script?src="testData.js"></script>
</body>
</html>