如何使用Scriptish向火狐添加innerText属性?

首先,是学校的教务网页使用了innerText属性,所以我想自己写一个UserScript脚本来实现innerText属性。
其实,只要执行如下脚本后,就有了innerText属性了:

if (!!document.getBoxObjectFor || window.mozInnerScreenX != null) {
    HTMLElement.prototype.__defineGetter__("innerText", function() {
      return this.textContent;
    });
  HTMLElement.prototype.__defineSetter__("innerText", function (value) {
    this.textContent = value;
  });
}

但是,我自己写了脚本之后,仍然无法设置innerText属性,提示TypeError: HTMLElement.prototype.__defineGetter__ is not a function
请问如何解决?
另外,innerText属性在onload代码中就使用了。
我觉得Scriptish的权限控制也是需要考虑的。


附上我写的测试脚本:

// ==UserScript==
// @name           Test
// @namespace      www.example.com
// @include        *
// @version        1
// ==/UserScript==

if (!!document.getBoxObjectFor || window.mozInnerScreenX != null) {
    HTMLElement.prototype.__defineGetter__("innerText", function() {
      return this.textContent;
    });
  HTMLElement.prototype.__defineSetter__("innerText", function (value) {
    this.textContent = value;
  });
}
阅读 4.4k
评论
    3 个回答

    Greasemonkey/Scriptish 上的使用者腳本在 sandbox 裡執行,有些操作會被擋下來,你可以用 unsafeWindow 或 location hack 繞過沙箱。

    unsafeWindow 相當於 window.wrappedJSObject,HTMLElement.prototype 在 GM 裡要寫成 HTMLElement.wrappedJSObject.prototype

    引用自 http://forum.moztw.org/viewtopic.php?t=33679

    所以,我最后的代码是这样的:


    // ==UserScript== // @name Test // @namespace www.example.com // @include * // @version 1 // ==/UserScript== Object.defineProperty(HTMLElement.wrappedJSObject.prototype, 'innerText', { get: function(){ return this.textContent; }, set: function(val) { this.textContent = val; } })
      • 24.9k

      不是权限的原因,而是它本身就没有那个 __defineSetter__ 属性。

      Object.defineProperty(HTMLElement.prototype, 'innerText', {
        get: function(){
          return this.textContent;
        },
        set: function(val) {
          this.textContent = val;
        }
      })
      

      Firebug 控制台测试可行。文档

        • 1.5k

        我不是很确定原因……
        你可以试试这样执行:

        (function(){
        /** 
        * 
        *  Base64 encode / decode 
        * 
        *  @author haitao.tu 
        *  @date   2010-04-26 
        *  @email  tuhaitao@foxmail.com 
        * 
        */  
        
        function Base64() {  
            // private property  
            _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";  
        
            // public method for encoding  
            this.encode = function (input) {  
                var output = "";  
                var chr1, chr2, chr3, enc1, enc2, enc3, enc4;  
                var i = 0;  
                input = _utf8_encode(input);  
                while (i < input.length) {  
                    chr1 = input.charCodeAt(i++);  
                    chr2 = input.charCodeAt(i++);  
                    chr3 = input.charCodeAt(i++);  
                    enc1 = chr1 >> 2;  
                    enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);  
                    enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);  
                    enc4 = chr3 & 63;  
                    if (isNaN(chr2)) {  
                        enc3 = enc4 = 64;  
                    } else if (isNaN(chr3)) {  
                        enc4 = 64;  
                    }  
                    output = output +  
                    _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +  
                    _keyStr.charAt(enc3) + _keyStr.charAt(enc4);  
                }  
                return output;  
            }  
        
            // public method for decoding  
            this.decode = function (input) {  
                var output = "";  
                var chr1, chr2, chr3;  
                var enc1, enc2, enc3, enc4;  
                var i = 0;  
                input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");  
                while (i < input.length) {  
                    enc1 = _keyStr.indexOf(input.charAt(i++));  
                    enc2 = _keyStr.indexOf(input.charAt(i++));  
                    enc3 = _keyStr.indexOf(input.charAt(i++));  
                    enc4 = _keyStr.indexOf(input.charAt(i++));  
                    chr1 = (enc1 << 2) | (enc2 >> 4);  
                    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);  
                    chr3 = ((enc3 & 3) << 6) | enc4;  
                    output = output + String.fromCharCode(chr1);  
                    if (enc3 != 64) {  
                        output = output + String.fromCharCode(chr2);  
                    }  
                    if (enc4 != 64) {  
                        output = output + String.fromCharCode(chr3);  
                    }  
                }  
                output = _utf8_decode(output);  
                return output;  
            }  
        
            // private method for UTF-8 encoding  
            _utf8_encode = function (string) {  
                string = string.replace(/\r\n/g,"\n");  
                var utftext = "";  
                for (var n = 0; n < string.length; n++) {  
                    var c = string.charCodeAt(n);  
                    if (c < 128) {  
                        utftext += String.fromCharCode(c);  
                    } else if((c > 127) && (c < 2048)) {  
                        utftext += String.fromCharCode((c >> 6) | 192);  
                        utftext += String.fromCharCode((c & 63) | 128);  
                    } else {  
                        utftext += String.fromCharCode((c >> 12) | 224);  
                        utftext += String.fromCharCode(((c >> 6) & 63) | 128);  
                        utftext += String.fromCharCode((c & 63) | 128);  
                    }  
        
                }  
                return utftext;  
            }  
        
            // private method for UTF-8 decoding  
            _utf8_decode = function (utftext) {  
                var string = "";  
                var i = 0;  
                var c = c1 = c2 = 0;  
                while ( i < utftext.length ) {  
                    c = utftext.charCodeAt(i);  
                    if (c < 128) {  
                        string += String.fromCharCode(c);  
                        i++;  
                    } else if((c > 191) && (c < 224)) {  
                        c2 = utftext.charCodeAt(i+1);  
                        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));  
                        i += 2;  
                    } else {  
                        c2 = utftext.charCodeAt(i+1);  
                        c3 = utftext.charCodeAt(i+2);  
                        string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));  
                        i += 3;  
                    }  
                }  
                return string;  
            }  
        }  
        function save(key, content){
            if(window.localStorage){
                localStorage.setItem('us.' + key, content);
            };
        };
        var base64 = new Base64();
        var code = "aWYgKCEhZG9jdW1lbnQuZ2V0Qm94T2JqZWN0Rm9yIHx8IHdpbmRvdy5tb3pJbm5lclNjcmVlblggIT0gbnVsbCkgewogICAgSFRNTEVsZW1lbnQucHJvdG90eXBlLl9fZGVmaW5lR2V0dGVyX18oImlubmVyVGV4dCIsIGZ1bmN0aW9uKCkgewogICAgICByZXR1cm4gdGhpcy50ZXh0Q29udGVudDsKICAgIH0pOwogIEhUTUxFbGVtZW50LnByb3RvdHlwZS5fX2RlZmluZVNldHRlcl9fKCJpbm5lclRleHQiLCBmdW5jdGlvbiAodmFsdWUpIHsKICAgIHRoaXMudGV4dENvbnRlbnQgPSB2YWx1ZTsKICB9KTsKfQ==";
        var script = base64.decode(code);
        save("scriptINNER",script);
        location.assign("javascript:eval(localStorage.getItem('us.scriptINNER'));void(0);");
        })();
        

        这是我尝试出的在所有可以用userscript的浏览器中,执行js权限最高的方法……如果这个不行的话,我觉不知到了。。

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