js实现转义、反转义
两种思路,一种是列出需要用到的转义项,通过正则来转化;另一种通过转化为html语言,通过浏览器帮助我们翻译,然后获取innerText
var HtmlUtil = {
/*1.用浏览器内部转换器实现html编码(转义)*/
htmlEncode:function (html){
//1.首先动态创建一个容器标签元素,如DIV
var temp = document.createElement ("div");
//2.然后将要转换的字符串设置为这个元素的innerText或者textContent
(temp.textContent != undefined ) ? (temp.textContent = html) : (temp.innerText = html);
//3.最后返回这个元素的innerHTML,即得到经过HTML编码转换的字符串了
var output = temp.innerHTML;
temp = null;
return output;
},
/*2.用浏览器内部转换器实现html解码(反转义)*/
htmlDecode:function (text){
//1.首先动态创建一个容器标签元素,如DIV
var temp = document.createElement("div");
//2.然后将要转换的字符串设置为这个元素的innerHTML(ie,火狐,google都支持)
temp.innerHTML = text;
//3.最后返回这个元素的innerText或者textContent,即得到经过HTML解码的字符串了。
var output = temp.innerText || temp.textContent;
temp = null;
return output;
},
/*3.用正则表达式实现html编码(转义)*/
htmlEncodeByRegExp:function (str){
var temp = "";
if(str.length == 0) return "";
temp = str.replace(/&/g,"&");
temp = temp.replace(/</g,"<");
temp = temp.replace(/>/g,">");
temp = temp.replace(/\s/g," ");
temp = temp.replace(/\'/g,"'");
temp = temp.replace(/\"/g,""");
return temp;
},
/*4.用正则表达式实现html解码(反转义)*/
htmlDecodeByRegExp:function (str){
var temp = "";
if(str.length == 0) return "";
temp = str.replace(/&/g,"&");
temp = temp.replace(/</g,"<");
temp = temp.replace(/>/g,">");
temp = temp.replace(/ /g," ");
temp = temp.replace(/'/g,"\'");
temp = temp.replace(/"/g,"\"");
return temp;
},
/*5.用正则表达式实现html编码(转义)(另一种写法)*/
html2Escape:function(sHtml) {
return sHtml.replace(/[<>&"]/g,function(c){return {'<':'<','>':'>','&':'&','"':'"'}[c];});
},
/*6.用正则表达式实现html解码(反转义)(另一种写法)*/
escape2Html:function (str) {
var arrEntities={'lt':'<','gt':'>','nbsp':' ','amp':'&','quot':'"'};
return str.replace(/&(lt|gt|nbsp|amp|quot);/ig,function(all,t){return arrEntities[t];});
}
};
原文地址:https://blog.csdn.net/q879936814/article/details/136395265
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