添加了 hash 方法，使得前端不必依赖 tic.crypto 而减小体积。

index.js

@@ -130,4 +130,14 @@ module.exports = {
     return format
   },
 
+  hash(data, {hasher='sha256', salt, input='utf8', output='hex'}={}){
+    if (typeof(data)!=='string' && !(data instanceof Buffer) && !(data instanceof DataView)) 
+      data=JSON.stringify(data)
+    if (salt && typeof(salt)==='string')
+      data=data+salt
+    let inputEncoding=input // my.INPUT_LIST.indexOf(option.input)>=0?option.input:my.INPUT // 'utf8', 'ascii' or 'latin1' for string data, default to utf8 if not specified; ignored for Buffer, TypedArray, or DataView.
+    let outputEncoding=(output==='buf')?undefined:output // (my.OUTPUT_LIST.indexOf(output)>=0?output:my.OUTPUT)  // option.output: 留空=》默认输出hex格式；或者手动指定 'buf', hex', 'latin1' or 'base64'
+    return require('crypto').createHash(hasher).update(data, inputEncoding).digest(outputEncoding)
+  },
+
 }