h5和app交互总结

• 与app约定跳转协议（jsbridge）,h5向app原生跳转时则根据协议：

1. window.location.href = 'xmj://login?token='+token

• app原生调用h5页面方法则需

1. 将js方法暴露给原生，放在最外层，先声明

<script type="text/javascript">
    var onResume = function(){}
</script>

　　然后可以在自己的js继续完成方法

onResume = function(){
    document.getElementsByClassName("login_btn")[0].style.display = 'block';
}

• app原生给h5传参

1. app原生将参数存储在cookie中，

• h5给原生传参

1. 放在url后边的参数中，
2. xmj://share?params=XXX 

3. 其中XXX为经过BASE64 UTF-8 UrlSafe 编码的Json数据

4. var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
   function base64encode(D) {
       var C, A, E;
       var G, F, B;
       E = D.length;
       A = 0;
       C = "";
       while (A < E) {
           G = D.charCodeAt(A++) & 255;
           if (A == E) {
               C += base64EncodeChars.charAt(G >> 2);
               C += base64EncodeChars.charAt((G & 3) << 4);
               C += "==";
               break
           }
           F = D.charCodeAt(A++);
           if (A == E) {
               C += base64EncodeChars.charAt(G >> 2);
               C += base64EncodeChars.charAt(((G & 3) << 4) | ((F & 240) >> 4));
               C += base64EncodeChars.charAt((F & 15) << 2);
               C += "=";
               break
           }
           B = D.charCodeAt(A++);
           C += base64EncodeChars.charAt(G >> 2);
           C += base64EncodeChars.charAt(((G & 3) << 4) | ((F & 240) >> 4));
           C += base64EncodeChars.charAt(((F & 15) << 2) | ((B & 192) >> 6));
           C += base64EncodeChars.charAt(B & 63)
       }
       return C
   }
   
   function utf16to8(str) {
       var out, i, len, c;
   
       out = "";
       len = str.length;
       for(i = 0; i < len; i++) {
       c = str.charCodeAt(i);
       if ((c >= 0x0001) && (c <= 0x007F)) {
           out += str.charAt(i);
       } else if (c > 0x07FF) {
           out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
           out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
           out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
       } else {
           out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
           out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
       }
       }
       return out;
   }