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function restr(str) {
var r = [
[/</g,"<"],
[/>/g,">"],
[/\?/g,"?"],
[/\//g,"/"],
[/\\/g,"\"],
[/\'/g,"'"],
[/\"/g,"""]
];
for (var i = 0; i < r.length; i++)
str = str.replace(r[i][0],r[i][1]);
return str;
}
alert(restr("a <123> \"bb\"?'g\\h/b'?"));
var chrs = {'<':'小于号','>':'大于号'};'<标签 />'.replace(/./gi,function(e){return chrs[e]||e})