在js中转义javascript实体？

Question

I want to escape javascript entities on client side. For example :-

If my input string is tes"t result should be tes\\"t

Is there any inbuilt function provided by jquery for this ?

Answer 1

This is a really crazy, almost stupid shot in the dark on my part, but...

If you're using a server-side language like PHP to output variables' contents into JavaScript, you should use json_encode as this handles ALL escaping for you, regardless of the type of variable.

On the other hand, if you're (I really hope you're not) doing something like this:

var input = "test"t";

And trying to escape that properly while in JavaScript... that's not going to work. It's a syntax error. You need to escape your literals manually.

Answer 2

Kevin van Zonneveld provide a JavaScript equivalent of PHP's addslashes here :
http://phpjs.org/functions/addslashes/

function addslashes(str) {
    //   example 1: addslashes("kevin's birthday");
    //   returns 1: "kevin\\'s birthday"

    return (str + '')
    .replace(/[\\"']/g, '\\$&')
    .replace(/\u0000/g, '\\0');
}

Based on this function, I guess you might want to add this function to prototype of the String like this.

if (!String.prototype.addslashes) {
   String.prototype.addslashes = function () {
       return this.replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
   };
}

var str = 'tes"t';
alert(str.addslashes()); // shows 'tes\"t'

DEMO: http://jsfiddle.net/naokiota/6F6aN/6/

Hope this helps.