用js实现判断当前网址的来路如果不是指定的来路就跳转到指定页面

<script type="text/javascript"> 
if(self!=top){top.location=self.location;} 
var ref=document.referrer; 
var domains=new Array("3water.com/","3water.cn/","3water.com.cn/"); 
var refpass=false; 
for(i=0;i<=domains.length;i++){if(ref.indexOf(domains[i])>0){refpass=true;break;}} 
if(ref==""){refpass=true} 
if(!refpass){window.location.href='https://3water.com';} 
</script>

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<script>
function isMatch(str1,str2) 
{  
var index = str1.indexOf(str2); 
if(index==-1) return false; 
return true; 
} 
alert(window.location.hostname);
if (isMatch(window.location.hostname,'3water.com') == false){window.location.href="https://3water.com";}
</script>

下面我们一个网站开发中用到的

function gotourl()
{
 var url = "https://3water.com"; 
 var localurl = document.url; 
 if( localurl.substring(0,url.length) != url )
 {
  location.href=url;
 }
}
gotourl();