minor V.js fixes

vlib/builtin/js/builtin.v

@@ -19,7 +19,7 @@ pub fn panic(s string) {
 }
 
 pub fn println(s string) {
-	#console.log(s)
+	#console.log(s.str)
 }
 
 pub fn eprintln(s string) {

vlib/builtin/js/string.v

@@ -17,6 +17,15 @@ fn C.strlen(s byteptr) int
 
 fn todo() { }
 
+pub fn tos(s byteptr) string {
+	len := 0
+	#len = s.length;
+	return string{
+		str: s
+		len: len
+	}	
+}	
+
 
 pub fn (a string) clone() string {
 	return a

vlib/compiler/gen_js.v

@@ -214,22 +214,22 @@ fn type_default(typ string) string {
 		return '{}'
 	}
 	// Default values for other types are not needed because of mandatory initialization
-	switch typ {
-	case 'bool': return '0'
-	case 'string': return '""'
-	case 'i8': return '0'
-	case 'i16': return '0'
-	case 'i64': return '0'
-	case 'u16': return '0'
-	case 'u32': return '0'
-	case 'u64': return '0'
-	case 'byte': return '0'
-	case 'int': return '0'
-	case 'rune': return '0'
-	case 'f32': return '0.0'
-	case 'f64': return '0.0'
-	case 'byteptr': return '0'
-	case 'voidptr': return '0'
+	match typ {
+		'bool'{ return '0'}
+		'string'{ return 'tos("")'}
+		'i8'{ return '0'}
+		'i16'{ return '0'}
+		'i64'{ return '0'}
+		'u16'{ return '0'}
+		'u32'{ return '0'}
+		'u64'{ return '0'}
+		'byte'{ return '0'}
+		'int'{ return '0'}
+		'rune'{ return '0'}
+		'f32'{ return '0.0'}
+		'f64'{ return '0.0'}
+		'byteptr'{ return '0'}
+		'voidptr'{ return '0'}
 	}
 	return '{}'
 }

vlib/compiler/parser.v

@@ -2688,7 +2688,7 @@ fn (p mut Parser) string_expr() {
 			p.gen("'$str'")
 		}
 		else if p.is_js {
-			p.gen('"$f"')
+			p.gen('tos("$f")')
 		}
 		else {
 			p.gen('tos3("$f")')