javascript - Change div's width by a value in JS -

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how change div's width value, this:

somediv.style.width += "100px";

it works when want set value (i.e. width = "100px") problem += operator.

this work vanilla javascript solution (since didn't mention jquery):

var somediv = document.getelementbyid("somediv"); var w = 0; if (typeof somediv.clip !== "undefined") {     w = somediv.clip.width; } else {     if (somediv.style.pixelwidth) {         w = somediv.style.pixelwidth;     } else {         w = somediv.offsetwidth;     } } somediv.style.width = (w + 100) + "px";

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