问我试图通过按回车键来运行javascript函数，但是我的语法是错误的

EN

<input id="keyword_box_sub" class="ac_input" type="text" value="" onfocus="if is.value == 'Search for products' ||this.value == 'Enter keyword or item #' ) {this.value = ''; $('#keyword_box_sub').removeClass('ac_input error').addClass('ac_input');}" onblur="if(this.value == '') {this.value = 'Search for products'; }" autocomplete="off" onkeypress="returnScript(event);">



$(keyword_box_sub).onkeypress=function returnScript(event);

function returnScript(event) {
    if (event.which == 13 || event.keyCode == 13) {
        getSearchSubString(); 
        return false;
    }
    return true;
});