Javascript calls js instance method in php

Source: Internet
Author: User
Tags instance method

These three methods are all found on the internet. The first test is acceptable, and the second Test is acceptable. However, the first Test may be incompatible with different browsers.
// Method 1
Echo "document. write ('<script language =" javascript "src ="/ads/js/$ js "> </script> ');";
// Method 2
Echo "var s = document. createelement ('script ');";
Echo "s. src = '/ads/js/$ js ';";
Echo "document. getelementsbytagname ('head') [0]. appendchild (s );";
// Method 3
Echo "document. write ("<scri '+ 'PT type = 'text/javascript' src = '/ads/js/$ js'> </scr' + 'ipt'> "); ";

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