<script>
alert('"hello"');
</script><script>
document.write('"hello"');
</script><script>
alert("\"hello\"");
</script><script>
document.write("\"hello\"");
</script>
alert('"hello"');
</script><script>
document.write('"hello"');
</script><script>
alert("\"hello\"");
</script><script>
document.write("\"hello\"");
</script>
var str= "a\"b\"c";//a = a"b"c