recover default example and add new one for wasm

Cargo.toml

@@ -27,7 +27,7 @@ humantime = { version = "2.0.0", optional = true }
 atty = { version = "0.2.5", optional = true }
 
 [target.wasm32-unknown-unknown.dependencies]
-wasm-bindgen = "*"
+wasm-bindgen = "^0.2.64"
 
 [[test]]
 name = "regexp_filter"

examples/default.rs

@@ -20,9 +20,6 @@ extern crate log;
 
 use env_logger::Env;
 
-#[cfg(all(target_arch = "wasm32", target_vendor = "unknown"))]
-use wasm_bindgen::prelude::wasm_bindgen;
-
 fn main() {
     // The `Env` lets us tweak what the environment
     // variables to read are and what the default
@@ -39,11 +36,3 @@ fn main() {
     warn!("some warning log");
     error!("some error log");
 }
-
-#[cfg_attr(
-    all(target_arch = "wasm32", target_vendor = "unknown"),
-    wasm_bindgen(start)
-)]
-pub fn start() {
-    main();
-}

examples/default_wasm.rs

@@ -0,0 +1,49 @@
+/*!
+Using `env_logger`.
+
+Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`:
+
+```no_run,shell
+$ export MY_LOG_LEVEL='info'
+```
+
+Also try setting the `MY_LOG_STYLE` environment variable to `never` to disable colors
+or `auto` to enable them:
+
+```no_run,shell
+$ export MY_LOG_STYLE=never
+```
+*/
+
+#[macro_use]
+extern crate log;
+
+use env_logger::Env;
+
+#[cfg(all(target_arch = "wasm32", target_vendor = "unknown"))]
+use wasm_bindgen::prelude::wasm_bindgen;
+
+fn main() {
+    // The `Env` lets us tweak what the environment
+    // variables to read are and what the default
+    // value is if they're missing
+    let env = Env::default()
+        .filter_or("MY_LOG_LEVEL", "trace")
+        .write_style_or("MY_LOG_STYLE", "always");
+
+    env_logger::init_from_env(env);
+
+    trace!("some trace log");
+    debug!("some debug log");
+    info!("some information log");
+    warn!("some warning log");
+    error!("some error log");
+}
+
+#[cfg_attr(
+    all(target_arch = "wasm32", target_vendor = "unknown"),
+    wasm_bindgen(start)
+)]
+pub fn start() {
+    main();
+}