javascript / jquery修改一个css类

Question

Before loading my page i want to make some modification on class style. The style class is included in MyStyle.css

.divNew {
    float: left; 
    margin: 10px 5px 5px 25px;
}

And loading a new page i want to modify/overload the margin and to add height. Any suggestion? This is what i've tried:

function pageLoad() {
    var theRules = new Array();
    if (document.styleSheets[0].cssRules) {
        theRules = document.styleSheets[0].cssRules;
    } else if (document.styleSheets[0].rules) {
        theRules = document.styleSheets[0].rules;
    }
    for (n in theRules) {
        if (theRules[n].selectorText == 'divNew') { ? ? ? ?
        }
    }
}

Answer 1

Using jQuery on Document ready you could do something like this.

$(document).ready(function(){
    $('.divNew').css('margin','modifications');  // .css('margin','10px 10px 10px 10px');
    $('.divNew').height(newHeight);  // .height(300)
});

For reference

http://api.jquery.com/css/

Answer 2

Use the jquery css function. It takes an object of CSS properties.

$(document).ready(function(){
    $('.divNew').css({
        "margin": "10px 5px 5px 25px",
        "height": "100px" //change to whatever your height is
    });
});

Answer 3

You're over complicating this by a billion percent.

$('.divNew').css({'height':'2000px', 'width':'2000px'});

just use comma seperated values with the built in jquery css method.